Needleless Syringe for Pig uses the instantaneous high pressure generated by the power source to make the drugs (liquid or freeze-dried powder) in the syringe form a high-speed and high-pressure jet flow through the nozzle (the flow rate is generally greater than 100 m/s). Except for the drug itself, the syringe has no other foreign matters entering the body, no needle contact, no cross infection between pigs, and no needle pricking risk exists for the operator.