Automatic welding equipment for large-diameter pipeline

The utility model relates to the technical field of welding equipment, and discloses automatic welding equipment for large-diameter pipelines, which comprises a base and a welding head connected with the base. The base comprises a first base body and a second base body, the first base body and the second base body are each provided with a first sliding groove, the two first sliding grooves communicate with each other, and the first base body and the second base body are each of a telescopic elastic structure; a first sliding groove is formed in the first base, a first sliding block is arranged on the first base, the first sliding block is matched with the first sliding groove, the first sliding block slides in the first sliding groove, a first fixing base is installed on the first sliding block, a supporting column is installed on the first fixing base, and a second fixing base is rotatably installed on the supporting column; and a third fixing seat is installed on the second fixing seat in a sliding mode, a