The present invention relates to a needleless liquid injection device, the body is provided with a first and second injection port is a fluid is selectively injected, the cylinder is provided with a rod that is operated back and forth by the fluid coupled and injected into the body； A pneumatic generator connected to the first and second inlets to supply high pressure air； Foot switch for controlling the operation of the high pressure air is injected into the cylinder； A shaft coupled to the front end of the cylinder body and connected to the rod； A chemical liquid injection member coupled to the front end of the shaft, the drug injection port being formed at the top, and an opening hole formed at the front end； A piston that is inserted into the chemical injection member and is coupled to the front end of the shaft and has a pumping operation to inhale or discharge fluid from the drug injection port while operating in an oscillating manner； Included in the front opening of the chemical injection member and a nozzle through which the discharge hole is formed in the front and the fine passage through which the chemical is transferred； includes, but is coupled to the outside of the shaft, an elastic member that exerts an elastic force to push the piston； It is coupled to the rear of the cylinder can be achieved by a needleless chemical injection device characterized in that it comprises a； buffer portion for alleviating the impact when the rod is reversed. According to this, since the compression expansion elastic force by the spring can be added, even if the gas pressure supplied to the cylinder is lower than the conventional pressure, pressure to penetrate the skin can be exerted.본 발명은 무바늘 약액 주사장치에 관한 것으로, 유체가 선택적으로 주입되는 제1,2주입구가 형성된 바디와, 상기 바디의 내부에 결합되고 주입되는 유체에 의해 전후 작동하는 로드가 구비된 실린더； 제1,2주입구에 연결되어 고압 에어를 공급하는 공압발생부； 실린더에 고압 에어가 주입되는 작동을 제어하는 풋스위치； 실린더의 바디의 전단부에 결합되며 로드와 연결된 샤프트； 샤프트의 전단에 결합되며 약물주입구가 상부에 형성되고 전단에 개구공이 형성된 약액주입부재； 약액주입부재의 내부에 삽입되며 상기 샤프트의 전단에 결합되고
