Wind turbine generator transmission chain brake locking system and use method thereof

The invention discloses a wind turbine generator transmission chain brake locking system and a using method thereof. The system comprises a coupler brake disc, a high-speed shaft brake, a support, a supporting arm, a driving oil cylinder and a locking piece. The outer ring of the coupler brake disc is tooth-shaped, the high-speed shaft brake is arranged on the outer edge of the coupler brake disc, one end of the support is connected to the high-speed shaft brake, and the middle of the supporting arm is rotatably connected to the other end of the support; a cylinder body of the driving oil cylinder is arranged at the bottom of the high-speed shaft brake, a piston rod extends downwards to be connected with one end of a supporting arm, and the other end of the supporting arm is in a tooth shape and is opposite to a coupler brake disc. The rotating shaft is driven by the driving oil cylinder to rotate to be meshed with the coupler brake disc or driven by the driving oil cylinder to rotate to be away from the coup