Positioning assembly of welding machine

The utility model discloses a welding machine positioning assembly which comprises a bottom frame, an L-shaped plate is fixedly installed at the bottom of the inner wall of the bottom frame and close to the rear side, an electric telescopic rod is fixedly installed at the top of the inner side of the L-shaped plate, a welding head is fixedly installed at the bottom end of the electric telescopic rod, a supporting plate is fixedly installed at the bottom of the inner wall of the bottom frame, and the welding head is fixedly installed at the bottom end of the supporting plate. A fixing cylinder is arranged above the supporting plate, a first hydraulic rod is fixedly installed on the inner wall of the fixing cylinder, an arc-shaped fixing plate is fixedly installed at the other end of the first hydraulic rod, screw rods are in threaded connection with the two sides of the bottom frame, and the other ends of the screw rods are rotationally connected with connecting blocks; a second hydraulic rod is fixedly mounte