Braking device for high-speed shaft of wind driven generator

The utility model provides a high-speed shaft braking device of a wind driven generator. The high-speed shaft braking device comprises an oil supply assembly, a control assembly and an executing mechanism. The oil supply assembly comprises an oil tank and a motor pump set, the oil tank is used for storing hydraulic oil, and the motor pump set is connected to the oil tank and used for conveying hydraulic oil. The control assembly comprises a first one-way valve, a throttling valve and an electromagnetic valve, and an outlet of the motor pump set is sequentially connected to the first one-way valve and the throttling valve. The electromagnetic valve is a two-position three-way valve and is provided with a port P, a port T and a port A. When the electromagnetic valve is powered on, the port P is communicated with the port A, and the port T is disconnected. And when the electromagnetic valve loses power, the T port is communicated with the A port, and the P port is disconnected. The P port is connected with an ou