A scalp clip gun comprises a housing, a magazine, a propulsion mechanism, characterized in that the scalp clip gun further comprises a locking mechanism; wherein a positioning protrusion is provided at a front end of the housing, a first end of the magazine is provided with a slot, the slot is cooperatively connected to the positioning protrusion, a positioning groove is provided at a rear end of the housing, a second end of the magazine is cooperatively connected with the positioning groove, the magazine is provided with an inner cavity that accommodates a plurality of scalp clips, both sides of the magazine are each provided with a latch, and a bottom portion is provided with an elongated slot; and the propulsion mechanism comprises a trigger, a guide rail, a tension spring, a transmission rack and a driver; the transmission rack is arranged in the housing and is slidable relative to the housing along the longitudinal direction of the housing, the transmission rack is provided with first transmission teeth, a trigger buckle and a rear protrusion, a first end of the trigger is rotatably arranged in the trigger buckle, the driver is arranged at a rear end of the transmission rack, a lower side of the driver is provided with second transmission teeth, the first transmission teeth engage with the second transmission teeth, the guide rail is arranged in a through-hole of the driver, the driver moves forward relative to the guide rail, a left side and a right side of the driver are each provided with a stopping protrusion, both sides of the magazine are provided with a plurality of positioning openings, the stopping protrusions are arranged to clamp and connect with the positioning openings at the magazine, a top portion of the driver is provided with an elastic piece, the elastic piece is used to reset the upwardly forced driver to a position that the transmission rack engages with the driver when the transmission rack moves rearward along the longitudinal direction of the housing; a tail end of the guide rail is fixed by means of the locking mechanism, an upper side and a lower side of the locking mechanism are provided with a first protrusion and a second protrusion that are respectively clampable with the first groove and the second groove at a tail end of the magazine; a first end of the tension spring is connected with the rear protrusion, and the second end of the tension spring is connected with a mounting column in the housing such that, when the transmission rack moves rearward along the longitudinal direction of the housing the tension spring is reset; the scalp clips are slidingly arranged on the guide rail. wherein a positioning protrusion is provided at a front end of the housing, a first end of the magazine is provided with a slot, the slot is cooperatively connected to the positioning protrusion, a positioning groove is provided at a rear end of the housing, a second end of the magazine is cooperatively connected with the positioning groove, the magazine is provided with an inner cavity that accommodates a plurality of scalp clips, both sides of the magazine are each provided with a latch, and a bottom portion is provided with an elongated slot; and the propulsion mechanism comprises a trigger, a guide rail, a tension spring, a transmission rack and a driver; the transmission rack is arranged in the housing and is slidable relative to the housing along the longitudinal direction of the housing, the transmission rack is provided with first transmission teeth, a trigger buckle and a rear protrusion, a first end of the trigger is rotatably arranged in the trigger buckle, the driver is arranged at a rear end of the transmission rack, a lower side of the driver is provided with second transmission teeth, the first transmission teeth engage with the second transmission teeth, the guide rail is arranged in a through-hole of the driver, the driver moves forward relative to the guide rail, a left side and a right side of the driver are each provided with a stopping protrusion, both sides of the magazine are provided with a plurality of positioning openings, the stopping protrusions are arranged to clamp and connect with the positioning openings at the magazine, a top portion of the driver is provided with an elastic piece, the elastic piece is used to reset the upwardly forced driver to a position that the transmission rack engages with the driver when the transmission rack moves rearward along the longitudinal direction of the housing; a tail end of the guide rail is fixed by means of the locking mechanism, an upper side and a lower side of the locking mechanism are provided with a first protrusion and a second protrusion that are respectively clampable with the first groove and the second groove at a tail end of the magazine; a first end of the tension spring is connected with the rear protrusion, and the second end of the tension spring is connected with a mounting column in the housing such that, when the transmission rack moves rearward along the longitudinal direction of the housing the tension spring is reset; the scalp clips are slidingly arranged on the guide rail.