The invention provides polyfunctionality hybrid cured resin and a preparation method thereof. The molecular chain of the polyfunctionality hybrid cured resin is of a comb-type structure, and includesa polyacrylate main chain and urethane acrylate side chains, wherein a plurality of acrylate double bonds and epoxy groups are contained in the side chains of the polyfunctionality hybrid cured resinseparately. The resin of the technical scheme has low viscosity and multiple functionality, the use amount of a diluent can be reduced in subsequent use, and the polyacrylate main chain and the urethane acrylate side chains are contained in the structure of the resin; and since a plurality of acrylate double bonds and epoxy groups are contained in the side chains, ultraviolet light-radical-heat hybrid curing or ultraviolet light-radical-cation hybrid curing can be achieved, and the degree of cross-linking of the resin obtained after hybrid curing is performed is improved greatly, so that thehardness, adhesion, wear resistance, solvent resistance, salt spray resistance and other properties of a cured film are improved effectively.