The double-trolley gantry crane is composed of gantry, crane crab, trolley traveling mechanism, cab and electric control system. The gantry is a box structure, and the beam is a double beam of skew track. According to user requirements, the legs are divided into A type and U type. Enclosed cab is used for operation. Adjustable seats, floor insulation pads, toughened glass for windows, fire extinguishers, electric fans, air conditioners, sound insulation, intercom and other auxiliary equipment can be equipped as required.