Push rod resetting mechanism of needleless injector

The invention relates to the technical field of needleless injectors, in particular to a push rod resetting mechanism of a needleless injector. The push rod resetting mechanism comprises an oil storage barrel for storing hydraulic oil, a pull rod and a resetting piston fixed at the front end of the pull rod, wherein the oil storage barrel is fixed on a gun body, the resetting piston is slidably mounted in the oil storage barrel, and a valve body is fixed at the front end of the gun body; and an oil return flow channel is formed in the valve body, the outer end of the oil return flow channel communicates with the front end of the oil storage barrel, the inner end of the oil return flow channel communicates with a part between a stepping piston and a hydraulic piston, and an oil return one-way valve used for preventing hydraulic oil between the stepping piston and the hydraulic piston from entering the oil storage barrel is arranged in the oil return flow channel. The oil return one-wayvalve is unlocked through