Medicament mixing injector

The utility model discloses a medicament mixing syringe, which comprises a barrel body, a syringe needle, a syringe needle and a syringe needle, the needle head is arranged on the cylinder body, and one end of the needle head is connected with the output port; the plug sleeve is arranged in the cylinder body in a sliding mode, and a liquid storage cavity is formed between the plug sleeve and the output port; the push rod penetrates through the plug sleeve in a sliding mode, the push rod and the barrel are coaxially arranged, and a handle is arranged at the end, away from the output port, of the push rod; the plug is arranged at the end of the push rod and located on the side, close to the output port, of the plug sleeve, and the maximum outer diameter of the plug is smaller than the inner diameter of the barrel. Through the arrangement of the plug sleeve and the plug head, after various components are sucked into the containing cavity, the push rod is pushed towards the output port, so that the plug head move