Fully-sealed ship gangplank device

The utility model discloses a fully-sealed ship gangplank device which comprises a gangplank, the gangplank is connected with a ship body structure through a hinge, two sides of the gangplank in the ship body are respectively provided with a winch and a base, and the base is respectively provided with a guide pulley I, a guide pulley II and a fixed pulley. The first guide pulley, the second guidepulley and the fixed pulley are all welded to the base, the movable pulley and the inclined guide pulley are arranged on the gangplank, the movable pulley and the inclined guide pulley are both weldedto the gangplank, a steel wire rope is arranged in the winch, and the steel wire rope comes out of a winding drum of the winch. The steel wire rope sequentially passes through the first guide pulley,the second guide pulley, the fixed pulley, the movable pulley, the inclined guide pulley, the movable pulley, the fixed pulley, the second guide pulley and the first guide pulley and then enters a winding drum of the winch, th