This gantry crane is mainly used for bridge construction and has a slow working speed. It consists of a gantry, a winch trolley, a crane operating mechanism, a driver's cab, and an electrical control system. The gantry is a truss structure, which has the advantages of light structure and strong wind resistance. Including the main beam, upper end beam, support legs, lower end beam, walking trolley, and walking platform railing. The main beam adopts a triangular truss structure, with tracks laid on top for the trolley to move horizontally along the direction of the main beam. The supporting legs are in two forms: box shaped or steel pipe. The car is equipped with a winch, which is compact in size and lightweight.