Large-diameter super-long steel pipe assembly welding tool

The utility model discloses a large-diameter super-long steel pipe assembly welding tool which comprises a bottom supporting frame and an upper crawling ladder, the upper crawling ladder is in an arch shape, is arranged at the butt-joint position of steel pipes, stretches across the butt-joint steel pipes and is provided with transverse ladder sections which are evenly arranged, scaffold boards are fixedly connected to the transverse ladder sections, and transverse steel beams are arranged on the bottom supporting frame. Supporting stand columns located on the two sides of the steel pipe are symmetrically arranged on the transverse steel beam, arc-shaped supporting plates matched with the steel pipe are arranged at the tops of the supporting stand columns, and pull rods are arranged between the tops of the inner sides of the supporting stand columns and the transverse steel beam. The bottom supporting frame provides supporting for steel pipe assembly and supports the steel pipes, the technical problems that t