The gantry type multi additional axis dual machine intelligent welding workstation is mainly used for robot automated welding of various steel structure buildings, bridges, ships and other structures. The workstation meets the welding requirements of various corner welds such as H-shaped steel structures, bridge slab units, and horizontal plates, and has continuous upgrading conditions. It will also adapt to welding in other scenarios in the future. Each gantry welding workstation includes a control system, gantry walking mechanism, 2 sets of arc welding robots, 2 sets of robot welding power supplies and cooling water tanks, 2 sets of intelligent welding vision systems, and 2 sets of water cooling gun systems.