Yaw brake for wind generating set

The invention discloses a yaw brake for a wind generating set. The brake comprises yaw brake bodies which are connected symmetrically, pistons are respectively arranged inside the yaw brake bodies, the pistons are connected with oil supply pipelines inside the yaw brake bodies, the oil supply pipelines are connected with a hydraulic station, stopping blocks are connected with positions which correspond to the pistons on the yaw brake bodies through detachable screws, one ends of the stopping blocks are matched with the yaw brake bodies, an installation groove is formed on one side where the pistons are close to each other respectively, friction sheet assemblies are arranged in the installation grooves respectively, and the friction sheet assemblies are connected with corresponding pistons and are matched closely with the installation grooves. The friction sheet assemblies are arranged in the installation grooves between the stopping blocks and the yaw brake bodies, and when the friction sheet assemblies are required to be replaced, the stopping blocks are only required to be loosened, so that the friction sheet assemblies in the installation grooves can be taken out rapidly, and the friction sheet assemblies are convenient to disassemble and replace.