Thick-wall cross column welding device based on steel structure

The utility model discloses a thick-wall cross column welding device based on a steel structure, and relates to the technical field of cross column welding, the thick-wall cross column welding device comprises a base, a first supporting arm, a second supporting arm and a welding assembly, the two sides of the top of the base are respectively connected with the first supporting arm and the second supporting arm in a sliding mode; welding assemblies are fixedly arranged on the opposite side walls of the first supporting arm and the second supporting arm correspondingly, and when the device is used, the distance between the first supporting arm and the second supporting arm can be increased or decreased under adjustment of the first lead screw; the welding assemblies located on the first supporting arm and the second supporting arm can be adjusted up and down under the adjustment of a second lead screw, and therefore cross column bodies of various specifications can be placed on the base; and the gas collecting