1. A surface-treating composition for a single-side-plated steel sheet, the
surface-treating composition comprising:
an acrylic-urethane copolymer resin (A);
a Si-Zr-Ti based organic-inorganic hybrid additive (B); and
a solvent, and
satisfies the following Formulas 1 and 2.
[Formula 1] 0.3 < [A]/([A]+[B]) < 0.7
[Formula 2] 20 wt% < [A]+[B] < 70 wt%
(In Formulas 1 and 2 above, [A] and [B] represent the content (wt%) of A above and the content (wt%) of B above, with respect to the total amount (100 wt%) of the surface-processing composition, respectively)
2. The surface-treating composition of claim 1, wherein:
the Si-Zr-Ti based organic-inorganic hybrid additive (B) is
a chelating compound formed by a reaction of a silicon (Si) based material, a zirconium (Zr) based chelating agent, a titanium (Ti) based chelating agent, and a neutralizing agent.
3. The surface-treating composition of claim 2, wherein:

the silicon (Si) based material is
one, or a mixture of two or three selected from silicon (Si) based materials including colloidal silica, silica sol, and silicate.
4. The surface-treating composition of claim 2, wherein:
the zirconium (Zr) based chelating agent is
one, or a mixture of two or three selected from zirconium (Zr) based chelating agents including zirconium alkoxide, zirconium acylate, and tetraalkyl zirconate.
5. The surface-treating composition of claim 2, wherein:
the titanium (Ti) based chelating agent is
one, or a mixture of two or three selected from titanium (Ti) based chelating agents including hexafluoro titanic acid, fluorotitanic acid, titanium dioxide, titanyl nitrate, titanyl sulfate, titanium tetrachloride, tetrabutyl titanic acid, hexafluoro ammonium titanate, and titanium alkoxide.
6. The surface-treating composition of claim 2, wherein:
the neutralizing agent is
one, or a mixture of two or three selected from amine based compounds

including isopropyl amine and triethyl amine.
7. The surface-treating composition of claim 1, wherein:
the acryl-urethane copolymer resin (A) is
a block copolymer of an acryl resin having a number average molecular weight of 500,000 to 1,500,000 and a urethane resin having a number average molecular weight of 5,000 to 15,000.
8. The surface-treating composition of claim 7, wherein:
the copolymerization ratio of the block copolymer is
40:60 to 60:40 as a weight ratio of the acryl resin to the urethane resin.
9. The surface-treating composition of claim 1, wherein:
the surface-treating composition further includes
a coupling agent, an adhesion enhancer, or a mixture thereof.
10. The surface-treating composition of claim 9, wherein:
the coupling agent is
one, or a mixture of two to three or more selected from silane based

coupling agents including g-glycidoxypropyl triethoxy silane, g-aminopropyltriethoxy silane, tetraethoxy silane, methyl trimethoxytyl silane, and 3-glycidoxypropyl trimethoxysilane.
11. The surface-treating composition of claim 9, further comprising:
the coupling agent,
wherein the content of the coupling agent is 0.5 to 10 wt% with respect to the total amount (100 wt%) of the surface-processing composition.
12. The surface-treating composition of claim 9, wherein:
the adhesion enhancer is
phosphoric acid ester, ammonium phosphate, or a mixture thereof.
13. The surface-treating composition of claim 9, further comprising:
the adhesion enhancer,
wherein the content of the adhesion enhancer is 2 to 20 wt% with respect to the total amount (100 wt%) of the surface-processing composition.
14. A single-side-plated steel sheet surface-processed, the single-side-

plated steel sheet comprising:
a single-side-plated steel sheet; and
a surface processing layer,
wherein the single-side-plated steel sheet includes a cold rolled steel sheet and a first coating layer disposed on a single side of the cold rolled steel sheet, and
the surface processing layer is disposed on the first coating layer of the single-side-plated steel sheet and includes an acryl-urethane copolymer resin (A) and a Si-Zr-Ti based organic-inorganic hybrid additive (B), and satisfies the following Formula 1.
[Formula 1] 0.3 < [A]/([A]+[B]) <0.7
(In Formula 1 above, [A] and [B] represent the content (wt%) of A above and the content (wt%) of B above, with respect to the total amount (100 wt%) of the surface-processing layer, respectively.)
15. The single-side-plated steel sheet surface-processed of claim 14,
wherein:
the mass of the surface processing layer per a single side of the single-side-plated steel sheet is
300 to 2500 mg/m2.
16. The single-side-plated steel sheet surface-processed of claim 14,

wherein:
the mass of the first coating layer per a single side of the cold rolled steel sheet is
5 to 300 g/m2.
17. The single-side-plated steel sheet surface-processed of claim 14,
wherein:
the first coating layer includes
zinc, a zinc-based alloy, or a combination thereof.
18. The single-side-plated steel sheet surface-processed of claim 14,
wherein:
the single-side-plated steel sheet further includes a second coating layer disposed on the other single side of the cold rolled steel sheet, and
the mass of the second coating layer per the single side of the cold rolled steel sheet is
10 mg/m2 or less (however, except for 0 mg/m2).
19. A surface-processing method of a single-side-plated steel sheet, the
surface-processing method comprising:

preparing a single-side-plated steel sheet including a cold rolled steel sheet and a first coating layer disposed on a single side of the cold rolled steel sheet;
coating a surface-treating composition on the first coating layer of the single-side-plated steel sheet; and
forming a surface processing layer by curing the coated surface-processing composition,
wherein the surface-treating composition includes an acryl-urethane copolymer resin (A), a Si-Zr-Ti based organic-inorganic hybrid additive (B) and a solvent, and satisfies the following Formulas 1 and 2.
[Formula 1] 0.3 < [A]/([A]+[B]) < 0.7
[Formula 2] 20 wt% < [A]+[B] < 70 wt%
(In Formulas 1 and 2 above, [A] and [B] represent the content (wt%) of A above and the content (wt%) of B above, with respect to the total amount (100 wt%) of the surface-processing layer, respectively.)
20. The surface-processing method of claim 19, wherein:
the coating of the surface-treating composition on the first coating layer
of the single-side-plated steel sheet
is performed by a roll coating method, a spray method, or a deposition
method.

21. The surface-processing method of claim 19, wherein:
the forming of the surface processing layer by curing the coated surface-processing composition
is performed in a temperature range of 130 to 250°C.
22. The surface-processing method of claim 19, wherein:
the preparing of the single-side-plated steel sheet
is performed by using a plating bath of which an edge mask is disposed on one side.