Gas storage tank welding device for double-seam aligned welding

The invention relates to the technical field of gas storage tank production equipment, in particular to a double-seam aligned welding gas storage tank welding device which comprises a rack, a base is arranged on the rack, the base comprises two horizontal supporting rollers and a driving unit, a lifting seat is mounted on the rack, a lower pressing roller parallel to the supporting rollers is rotatably mounted at the bottom of the lifting seat, and the driving unit is mounted on the lower pressing roller. The two welding devices are arranged at the two ends of the lower pressing roller correspondingly, and the working ends of the welding devices are flush with the lowest point of the outer wall of the lower pressing roller. Inserting rods are fixedly installed on one side of the welding device and inserted into a rotating cylinder rotationally installed at the bottom of the lifting base. The rotary drum is connected with the lower compression roller through a transmission belt; according to the technical sche