Square tube transverse frame welding workbench

The utility model belongs to the field of square tube cross frame machining, and particularly relates to a square tube cross frame welding workbench which comprises a base, a clamping block is connected to the base in a sliding mode, a sliding block is welded to the clamping block, a sliding groove is formed in the base, the sliding block is connected into the sliding groove in a sliding mode, and a lead screw is connected into the sliding block through threads. A guide groove is formed in the base, a lead screw is movably connected into the guide groove, a containing groove is formed in the clamping block, a plurality of square grooves are formed in the clamping block, the square grooves are distributed in the clamping block in a linear mode, and square rods are slidably connected into the square grooves in a sleeved mode. The guide groove is formed in the base, the lead screw is movably connected into the guide groove, the lead screw and the sliding block are rotated to do threaded motion, the sliding block