Hydraulic power generation device

The invention relates to the field of machinery, in particular to a hydraulic power generation device which comprises a machine frame, a gearbox and a power generator, the gearbox and the power generator are arranged on the lower portion of the machine frame, a first driving shaft and a second driving shaft which are arranged in parallel are arranged on a longitudinal beam on the machine frame, and a first gear is arranged on the first driving shaft close to the middle of a shaft body. A second gear meshed with the first gear is arranged at the position, close to the middle of a shaft body, of the second driving shaft, a second rotating disc and a third rotating disc are arranged at the two ends of the first driving shaft respectively, a second pin shaft is arranged at the position, close to the edge of the disc body, of the second rotating disc, and the second pin shaft is movably hinged to the telescopic end of a second hydraulic cylinder; the bottom of a cylinder body of the second hydraulic cylinder is mo