The double girder gantry crane is mainly composed of a mast, a lifting trolley, a trolley running mechanism, a driver’s cab and an electrical control system. The gantry is divided into box structure and truss structure. The main beam adopts double beam partial rail form, and the outriggers are divided into A shape and U shape according to user requirements. The operation method adopts a closed driver’s cab with adjustable seats, the floor is laid with insulating mats, the window glass is made of tempered glass, and items such as heating and cooling air conditioners, sounders, and intercoms can be configured according to user requirements. There are two forms of power supply: cable drum and high-altitude slide wire.