Pre-filled injector

The utility model discloses a pre-filled injector, which is formed by a pushing device assembly and a liquid medicine bottle assembly, wherein a bottle body of the liquid medicine bottle assembly is designed to be a cylindrical or corner post structure to contain injection; a Luer taper and a turncap are arranged on one end of the bottle body; the seal of the injection is realized through a close cvoer; the Luer taper can be quickly jointed with an injection needle; a sealing device matched with the shape of the bottle body is arranged on the other end so as to seal the injection; the pushing device assembly can realize the motion of pushing the sealing device. According to the pre-filled injector, a small bottle containing the injection is designed to have an injection function, the small bottle is convenient and quick and can be combined with a pushing device to form an injection device, and the sealing device of a liquid medicine bottle cannot be pulled back after being used; injection production enterprises can conveniently produce the injector in batch, and hospitals and patients can use the injector conveniently.