Hydraulic brake power plant for barring wind turbine generator with constant voltage

The utility model provides a hydraulic brake power plant for a barring wind turbine generator with constant voltage, which relates to the technical field of wind power generation and solves the technical problem that the barring safety is low. The device comprises an oil tank, a main shaft braking circuit, a yawing braking circuit, a barring working circuit with voltage and an oil supply circuit, wherein the oil suction port of the oil supply circuit is connected to the oil tank; the oil supply port of the oil supply circuit is connected with the pressure oil port of a main shaft brake through the main shaft braking circuit, and is connected with the pressure oil port of a yawing brake through the yawing braking circuit; and the barring working circuit with the voltage is connected in parallel with the main shaft braking circuit, comprises a barring electromagnetic valve and a hydraulic control one-way valve and is provided with a barring overflow valve used for controlling main shaft barring back pressure. In the device provided by the utility model, the main shaft barring is stable and has high safety.