Hydraulic supercharging device

The utility model discloses a hydraulic pressurizing device, relates to the technical field of internal high-pressure bulging machines, is applied to a water bulging process, and solves the problem that a large amount of common air can be accumulated at the high position of an injection device due to the action of gravity and cannot normally flow out of the injection device, so that the quality ofbulging parts is influenced. According to the technical scheme, the injector is characterized by comprising an injection cylinder and a pressurizing cylinder, a piston rod is arranged in the pressurizing cylinder, and an injection rod is arranged in the injection cylinder and connected with the piston rod; the injection cylinder and the pressurizing cylinder are vertically arranged; a main pipeline is arranged on the injection cylinder; a circulation channel is formed in the injection rod, one end of the circulation channel is communicated with the main pipeline, and the other end of the circulation channel extends o