Self-service type injection gun

The utility model relates to the field of medical equipment, in particular to a self-service injection gun. The self-service type injection gun comprises a sleeve shell, an injection device and a propelling device. The injection device comprises an elastic part, an injection needle, a syringe, a piston and a remaining needle. The lower end wall of the syringe is in sealing contact with the injection needle, the piston is in sealing contact with the side wall of the syringe, and therefore a sealed cavity is formed by an inner syringe cavity below the piston. The upper end face of the injection needle is sealed, and a through hole is formed in the side wall of the injection needle and located in the sealed cavity. The propelling device comprises a pressing feeding piece and a pushing feeding piece, one end of the pressing feeding piece is hinged to the outer wall of the sleeve shell, and the outer end of the pushing feeding piece is hinged to the inner surface of the pressing feeding piece. A limiting groove capable of being connected with the inner end of the pushing feeding piece in a clamped mode is formed in the outer surface of the side wall of the syringe, and the outer end of the pushing feeding piece penetrates through a hole formed in the side wall of the sleeve shell to be connected with the limiting groove in a clamped mode. The self-service injection gun has the advantages of being convenient to carry, easy to operate, accurate in injection and capable of injecting a plurality of positions on the human body.