Needle replacement type continuous injector for animals

The utility model discloses a syringe needle replacement type continuous syringe for animals, and belongs to the technical field of veterinary syringes. According to the injector, a needle cylinder piston rod is arranged in a needle cylinder; the injector comprises a medicine feeding structure, a medicine pumping structure and a needle replacing structure, the medicine feeding structure adopts aninjection pull rod to drive a medicine feeding plate, the other end of the medicine feeding plate acts on a fixing gear, and the medicine feeding plate clamps a piston rod of the needle cylinder to enable the piston rod to move downwards to complete the medicine feeding process. The used needle head is withdrawn by the needle head bin through the outer vertical surface of the needle head claw; theneedle bin is continuously pulled outwards, the extension needle cylinder leaves the needle falling bin, the new needle falls into the needle falling bin under the action of the baffle and the bafflespring, the needle bin is