Buoyancy tank door structure for breakwater entrance door

The invention discloses a buoyancy tank door structure for a breakwater entrance door, which comprises a buoyancy tank main body which is of a caisson structure directly facing the breakwater entrance door, and the outer wall of the buoyancy tank main body close to one vertex angle of a breakwater is rotatably arranged on the inner side of the breakwater entrance door through a rotating pile; when the buoyancy tank body rotates to the middle of the breakwater entrance, the side length, perpendicular to the channel direction, of the buoyancy tank body is slightly larger than the width of the breakwater entrance, and an irrigation and drainage system is arranged in the buoyancy tank body to control the water level in the buoyancy tank body. And the opening and closing system is a traction structure arranged between the buoyancy tank main body and the breakwater top so as to control the rotation of the buoyancy tank main body. On the basis that the original structure of an existing breakwater is not changed, the