The invention discloses a wind driven generator hybrid brake system and brake method, and relates to the technology of the wind driven generator hybrid brake technology. The wind driven generator hybrid brake system and brake method aim at solving the problem that an exiting wind driven generator mechanical brake device and method cannot give consideration to brake torque and torque borne by a gearbox, and the brake effect is poor. The system comprises a wind speed measuring unit, a wind direction measuring unit, a main controller, a yaw control unit, an alarm unit, a thickness detection unit, a rotating speed detection unit, a rotating disc, a mechanical brake device I, a mechanical brake device II and an electromagnetic brake device. The working state of the system is stable, and the mechanical brake devices are small in brake torque, the torque borne by the gearbox is small, the control precision is high, the stress borne by a brake axle can be reduced, and the service life of the brake system is prolonged; and emergent brake and safe brake effects of a wind driven generator are achieved, real-time self repairing is achieved, and the system and method are suitable for being applied to brake of the wind driven generator.