The invention relates to the technical field of maintenance equipment, and discloses port special machinery metal structure fault maintenance equipment. The port special machinery metal structure fault maintenance equipment comprises a cabinet body, a circular groove which allows a rotating column to be rotationally connected is formed in a position, close to the edge, of the middle of the upper surface of the cabinet body, the top end face of the rotating column is fixedly connected to the circle center of the bottom face of an equipment containing disc; and meanwhile, a limiting piece used for limiting rotation of the equipment containing disc is further arranged on the upper edge of the corresponding side face of the cabinet body, and a positioning mechanism used for performing clampingon a mechanical metal part before maintenance is arranged on the upper surface of the equipment containing disc. According to the port special machinery metal structure fault maintenance equipment, the positioning requirement of the mechanical metal part during maintenance can be met by means of the positioning mechanism, in this way, the situation that operation is inconvenient due to shaking ofthe mechanical metal part can be avoided when disassembly, assembly, welding and other operation are carried out, and the by means of the rotation of the equipment containing disc, orientation of themechanical metal part can be changed, and operation convenience is better facilitated.