Disclosed is a marine organism antifouling apparatus for ships using a UV-C module. The marine organism antifouling apparatus includes circular or polygonal net units and at least one UV-C module configured to be turned on to emit ultraviolet light by power supplied thereto, the UV-C module being provided at each of the net units, wherein the net units are connected to each other in horizontal and vertical directions to constitute a net member, and ultraviolet light is emitted from the UV-C module to prevent attachment of marine organisms in the state in which an underwater exposure zone of a ship that is moored is surrounded by the net member.