Welding tool for modularized house steel structure

The welding tool for the modularized house steel structure comprises a supporting plate and a clamping box, auxiliary positioning devices are symmetrically arranged in the clamping box, each auxiliary positioning device comprises a sliding rod and a sleeve, the sliding rods are slidably connected with the inner surfaces of the sleeves, one ends of the sliding rods are fixedly connected with one ends of first springs, and the other ends of the first springs are fixedly connected with the clamping box. The handle abuts against the surfaces of the positioning blocks, the multiple sets of positioning blocks are fixedly connected with the surface of the clamping box, a groove is formed in the surface of the sleeve, the auxiliary positioning device and the clamping device are matched, the wire wheel can wind the pull rope, the pull rope can lift the clamping box, and the steel frame can be lifted; the steel frame is moved to a proper position, the frame is welded, the steel frame is clamped and fixed, so that the s