Large-diameter steel pipe welding tool

The utility model relates to the technical field of steel pipe welding tools, in particular to a large-diameter steel pipe welding tool, which is used for supporting, adjusting and fixing a steel pipe, and adopts the technical scheme that the large-diameter steel pipe welding tool comprises two groups of supporting racks for supporting the steel pipe, and the two groups of supporting racks are fixedly connected through a connecting frame; each supporting rack comprises a bottom rack and an arc-shaped support fixed to the end of the bottom rack to form an inwards-concave supporting structure, two symmetrically-arranged driving rollers are rotationally installed at the bottom of the inner side of each arc-shaped support, and a plurality of auxiliary rotating rollers for auxiliary supporting of a steel pipe are evenly distributed on the outer sides of the driving rollers in the trend of the arc-shaped supports; and the driving motor is used for driving the driving roller to rotate, drives the driving roller to r