Welding rotating tool

The utility model discloses a rotary tool for welding. The device comprises a vertical plate, supporting plates are perpendicularly and fixedly connected to the left side and the right side of the top of the vertical plate respectively, ball screws are rotationally installed in the supporting plates and rotationally connected with the inner top walls and the inner bottom walls of the supporting plates respectively, first motors are fixedly installed at the tops of the supporting plates, and output rotating shafts of the first motors penetrate through the supporting plates; an output rotating shaft of the first motor is fixedly connected with the upper portion of the ball screw, the side walls of the two supporting plates are slidably connected with one ends of sliding blocks, and the sliding blocks are arranged on the opposite side walls of the two supporting plates. The middle of one end of each sliding block sleeves the outer wall of the ball screw in a threaded mode, the other ends of the two sliding block