Stud welding gun with limit device

The utility model discloses a stud welding gun with a limit device, aims at providing the stud welding gun provided with the limit device, and solves the problem in the prior art that a welding gun sleeve is difficult to position. The stud welding gun comprises a stud welding gun body, a guide rail mounting seat which is fixedly connected with the welding gun body, a movable guide rail and the welding gun sleeve linked with the guide rail, wherein the limit device is arranged on the guide rail and comprises a sliding block arranged on the guide rail and a locking structure arranged on the sliding block; and the locking structure can lock the sliding block to enable the sliding block and the guide rail to link. The utility model has the advantage that the function of quickly positioning the welding gun sleeve can be achieved.