Welding tool convenient for positioning

The invention discloses a welding tool convenient for positioning, including a base. Four positioning blocks are slidably mounted on the top of the base, the four positioning blocks are adapted to oneanother in pairs, the top of the base is provided with four sliding grooves, a slide block is slidably installed in the sliding groove, the top of the slide block is welded to the bottom of the corresponding positioning block, a threaded through hole is arranged on the slide block, a screw rod is threadedly arranged in the threaded through hole, two chambers are arranged on the base, the chamberis located in the middle position of the corresponding two sliding grooves, and first through holes are arranged on the inner walls of both sides of the chambers, the two first through holes respectively communicate with the corresponding sliding grooves, and the ends of the corresponding two screw rods close to each other extend into the corresponding chamber and are welded with the same first gear. The invention has the