Self-excited underground low-frequency high-pressure pulsating hydraulic fracturing generating device

The utility model relates to a self-excitation type underground low-frequency high-pressure pulsating hydraulic fracturing generating device which comprises a cylinder body, a hydraulic control system and a hydraulic control system. The piston is arranged in the cavity of the cylinder body, the whole piston is of a frustum-shaped structure, and a flow guide channel which extends in the axial direction of the piston and penetrates through the upper end and the lower end of the piston is formed in the piston; the piston is arranged in the cavity of the cylinder body, the bearing seat is also arranged in the cavity of the cylinder body and located at the lower end of the piston, the plug is of a conical structure and is in timely contact with the flow guide channel, and a plurality of flow guide holes are evenly formed in the circumferential direction of the bearing seat at intervals; and the reset piece is arranged on the plug in a sleeving manner. According to the device, the mechanical piston is pushed throug