The invention relates to an ultraviolet curing coating and a preparation method thereof. The preparation method of the ultraviolet curing coating comprises the following steps: enabling diisocyanate to react with 1,4-cyclohexyl dimethyl carbinol to obtain modified diisocyanate; enabling the modified diisocyanate to react with diol to obtain a first reaction liquid; adding polyhydroxyl carboxylic acid and a catalyst into the first reaction liquid to obtain a second reaction liquid; mixing the second reaction liquid with a chain extender for reaction to obtain a third reaction liquid; adding hydroxyl acrylate and a polymerization inhibitor into the third reaction liquid for reaction to obtain a fourth reaction liquid; adding triethylamine into the fourth reaction liquid for reaction to obtain a polyurethane acrylate prepolymer; adding deionized water into the polyurethane acrylate prepolymer to obtain a polyurethane acrylate dispersion; mixing the polyurethane acrylate dispersion with a filler, a photoinitiator, a leveling agent, an antifoaming agent and a dispersing agent; and stirring and dispersing to obtain the ultraviolet curing coating. The ultraviolet curing coating prepared by the method has relatively high performance.