Welding gun facilitating replacement of quick-wear parts

The utility model discloses a welding gun convenient to replace quick-wear parts, which comprises a welding gun tube, a mounting groove is arranged at the front end of the welding gun tube, a welding gun head is arranged in the mounting groove, elastic iron sheets are arranged on two opposite sides of the welding gun head, and the elastic iron sheets are arranged in the mounting groove. Through grooves are formed in the side walls, corresponding to the positions of the two elastic iron sheets, of the welding gun pipe in a penetrating mode, the two elastic iron sheets are located in the two through grooves correspondingly, the welding gun pipe is sleeved with a protective sleeve shell, and pressing plates are arranged on the two opposite sides of the protective sleeve shell correspondingly. The two pressing plates are connected with the side wall of the protective sleeve shell through elastic devices correspondingly, locking devices are fixedly connected to the positions, close to the side wall of the protecti