This double-gun double-station automatic welding machine is suitable for long pipes, double-head flange inner and outer ring welds. Double-gun double-station welding can be equipped with a variety of welding equipment such as argon arc welding, two-shield welding, MIG/MAG welding, plasma welding, etc. Welding operating arm + full-angle positioner + welding gun angle adjustment mechanism ensures the welding gun can be converted in multiple positions and angles.