Special welding tool clamp for general heavy truck tractor type step support

The utility model discloses a special welding tool clamp for a general heavy truck tractor type step support, and relates to the technical field of welding tool clamps. The device comprises a base, a backrest plate is arranged at the position, close to the rear side, of the top of the base, the backrest plate is fixedly installed on the base, supporting plates are arranged at the positions, close to the two sides, of the front side of the backrest plate, a first lining plate and a second lining plate are arranged between the supporting plates on the two sides of the front side of the backrest plate, and rapid clamp pressing clamps are arranged on the top of the backrest plate and the surface of the front side of a U-shaped plate fixing plate. Through the structures such as the first inner lining plate, the second inner lining plate, the U-shaped plate fixing plate and the rapid clamp pressing clamp, and through the internal positioning mode and buckle type auxiliary positioning of the first inner lining plate