The invention discloses a surfboard, paddle and sailing ship three-in-one structure convenient to assemble and disassemble. The surfboard, paddle and sailing ship three-in-one structure convenient to assemble and disassemble is composed of a base board, an end buckle board, a left buckle board and a right buckle board in an assembling mode. The end buckle board is of a U shape, is buckled at the blunt end of the base board and holds the end portion of the left buckle board and the end portion of the right buckle board together. The left buckle board and the right buckle board are buckled on the base board in a held mode and the tail portion of the left buckle board and the tail portion of the right buckle board are collected at the sharp end of the base board. The four portions can be fixed through three screws. When the surfboard, paddle and sailing ship three-in-one structure is used as a surfboard, only the base board is selected and a rubber plate is installed through a second set of installation holes. People can stand on the base board and control the rubber plate through the feet so that surfing can be achieved in water. When the surfboard, paddle and sailing ship three-in-one structure is used as a paddle, the base board, the end buckle board, the left buckle board and the right buckle board are assembled and fixed together and the rubber plate is installed through a first set of installation holes so that people can paddle in water in a standing mode or a sitting mode through the paddle. When the surfboard, paddle and sailing ship three-in-one structure is used as a sailing ship, the base board, the end buckle board, the left buckle board and the right buckle board are assembled and fixed together, the rubber plate is installed through the first set of installation holes, and a sail is installed through the second set of installation holes so that people can sail in water by means of controlling the windward side of the sailing ship.