A UV-curable aqueous emulsion comprising: (a) a urethane reaction product of 1 to 10 % by weight of a polycarbonate polyol or polyester polyol, 1 to 10 % by weight of an isocyanate compound, 0.1 to 5 % by weight of a reactive carboxylic acid, 1 to 10 % by weight of a UV-curable acrylic oligomer having 2 to 9 functional acrylate groups and, wherein the UV-curable acrylic oligomer is selected from the group consisting of urethane acrylate, polyurethane acrylate, ester acrylate, polyester acrylate and a mixture thereof, and wherein the UV-curable acrylic oligomer is a mixture of an oligomer having 4 or more functional acrylate groups and an oligomer having 3 or less functional acrylate groups, 5 to 20 % by weight of a UV-curable acrylic monomer selected from the group consisting of trimethylolpropane triacrylate(TMPTA), tripropyleneglycol diacrylate(TPGDA), 1,6-hexamethylenediol diacrylate(HDDA), 1,4-butanediol diacrylate(1,4-BDDA), 1,3-isobutanediol diacrylate, isobornyl acrylate(IBOA) and a mixture thereof; and (b) 0.1 to 20 % by weight of a urethane-reactive acrylate, 0.01 to 1 % by weight of a radical polymerization inhibitor and 55 to 75 % by weight of water, based on the total weight of the UV-curable aqueous emulsion. (a) a urethane reaction product of 1 to 10 % by weight of a polycarbonate polyol or polyester polyol, 1 to 10 % by weight of an isocyanate compound, 0.1 to 5 % by weight of a reactive carboxylic acid, 1 to 10 % by weight of a UV-curable acrylic oligomer having 2 to 9 functional acrylate groups and, wherein the UV-curable acrylic oligomer is selected from the group consisting of urethane acrylate, polyurethane acrylate, ester acrylate, polyester acrylate and a mixture thereof, and wherein the UV-curable acrylic oligomer is a mixture of an oligomer having 4 or more functional acrylate groups and an oligomer having 3 or less functional acrylate groups, 5 to 20 % by weight of a UV-curable acrylic monomer selected from the group consisting of trimethylolpropane triacrylate(TMPTA), tripropyleneglycol diacrylate(TPGDA), 1,6-hexamethylenediol diacrylate(HDDA), 1,4-butanediol diacrylate(1,4-BDDA), 1,3-isobutanediol diacrylate, isobornyl acrylate(IBOA) and a mixture thereof; and 1 to 10 % by weight of a polycarbonate polyol or polyester polyol, 1 to 10 % by weight of an isocyanate compound, 0.1 to 5 % by weight of a reactive carboxylic acid, 1 to 10 % by weight of a UV-curable acrylic oligomer having 2 to 9 functional acrylate groups and, wherein the UV-curable acrylic oligomer is selected from the group consisting of urethane acrylate, polyurethane acrylate, ester acrylate, polyester acrylate and a mixture thereof, and wherein the UV-curable acrylic oligomer is a mixture of an oligomer having 4 or more functional acrylate groups and an oligomer having 3 or less functional acrylate groups, 5 to 20 % by weight of a UV-curable acrylic monomer selected from the group consisting of trimethylolpropane triacrylate(TMPTA), tripropyleneglycol diacrylate(TPGDA), 1,6-hexamethylenediol diacrylate(HDDA), 1,4-butanediol diacrylate(1,4-BDDA), 1,3-isobutanediol diacrylate, isobornyl acrylate(IBOA) and a mixture thereof; and (b) 0.1 to 20 % by weight of a urethane-reactive acrylate, 0.01 to 1 % by weight of a radical polymerization inhibitor and 55 to 75 % by weight of water, 0.01 to 1 % by weight of a radical polymerization inhibitor and 55 to 75 % by weight of water,