The double main beam gantry crane is composed of a mast, a hoisting trolley, a trolley driving mechanism, a driver's cabin and an electrical control system. The portal is divided into box and truss structure. The main beam is in double deflection shape. The outriggers are divided into A and U shape according to user requirements. The operating mode uses an enclosed driver's cabin with adjustable seats, insulating floor pads and tempered glass on the windows. Depending on the user's requirements, the cabin can be equipped with heating and cooling air conditioners, buzzers, intercoms and other equipment. There are two ways to supply power: cable reel and high-altitude guide.