The invention relates to the technical field of coatings, and provides a hyperbranched star-like polymer capable of ultraviolet light curing and a preparation method and application thereof. The hyperbranched star-like polymer capable of ultraviolet light curing comprises a hyperbranched polymer core and a linear polymer arm, wherein the hyperbranched polymer core is connected with the linear polymer arm through a chemical bond; and the terminal hydroxyl group of the hyperbranched star-like polymer is modified into a group containing carbon-carbon double bonds. The hyperbranched star-like polymer provided by the invention has the capacity of rapid ultraviolet light curing, and the hyperbranched star-like polymer combines the advantages of the hyperbranched polymer and the linear polymer under the condition that the degree of polymerization of the linear polymer is appropriate, so that the leveling property, curing rate, hardness, adhesive force, tolerance and the like of the coating are improved, and the hyperbranched star-like polymer is expected to be applied to the fields of automobiles, medical treatment and the like in consideration of good adhesive force and high biological degradability.