Positioning auxiliary device for welding automobile silencer

The utility model discloses an auxiliary positioning device for welding an automobile silencer, which belongs to the technical field of automobile silencers and comprises a base plate, two mounting plates fixedly mounted on the upper surface of the base plate, a plurality of sliding rods fixedly mounted between opposite surfaces of the two mounting plates and two moving blocks slidably mounted on the outer surfaces of the plurality of sliding rods. The fixed blocks are fixedly installed on the outer surfaces of the multiple sliding rods and located between the two moving blocks, clamping assemblies facilitating clamping of silencers of different sizes are arranged on the upper surfaces of the moving blocks, rotating shafts are rotationally installed on the fixed blocks, and rotating rods are fixedly installed at the ends of the rotating shafts; the two ends of the rotating rod are rotationally connected with hinge rods; and therefore, when the hand wheel is rotated, the two moving blocks and the clamping bloc