The double main beam gantry crane mainly consists of a gantry, a lifting trolley, a crane operating mechanism, a driver's cab, and an electrical control system. The gantry is divided into a box shaped structure and a truss structure. The main beam adopts a double beam eccentric rail form, and the support legs are divided into two types according to user requirements: A-shaped and U-shaped. The operation mode adopts a closed driver's cab, which has adjustable seats, an insulation mat laid on the bottom plate, and tempered glass used for the window glass. According to user requirements, items such as cold and warm air conditioning, sounders, walkie talkies, etc. can be configured. There are two forms of power supply: cable reel and high-altitude sliding wire.