The invention discloses UV (ultraviolet) self-crosslinking type fluororubber and a preparation method thereof. The fluororubber prepared by the method disclosed by the invention can perform self crosslinking under UV illumination without additional addition of a photoinitiator or a crosslinking agent. The problem that the existing fluororubber is difficult to cure is solved, and the application of the fluororubber in the fields of adhesives and coatings is broadened.