Automatic welding device for back girders of container

The utility model discloses an automatic welding device for back girders of a container. The automatic welding device for the back girders of the container comprises a fixed rack and at least one automatic tracking mechanism, wherein longitudinal moving equipment and transverse moving equipment are arranged on the fixed rack; the automatic tracking mechanisms are arranged on the lower portion of the fixed rack and are connected with the transverse moving equipment; detecting equipment for detecting the back girders of the containers is arranged on the bottom of each automatic tracking mechanism; at least one side of each detecting equipment is provided with a welding gun; each automatic tracking mechanism is provided with vertical moving equipment; and each vertical moving equipment drives the corresponding welding gun to move along the vertical direction. By the automatic welding device for the back girders of the containers, manual operation is not required, the welding guns can be automatically aligned with positions of welding of the back girders of the container, and the back girders can be welded automatically. The welding quality is improved, and the production efficiency is also improved.