The utility model discloses a wind generating set blade feathering reserve safety arrangement, it includes programmable logic controler, limit switch, change oar control circuit, holdback gear, solenoid valve, the holdback gear respectively with the change oar bearing of three blade in gear mesh, the system just often, the holdback gear is with to become oar bearing inner gearing rotatory, when the system failure, the rotation of blade feathering orientation can only be faced to solenoid valve control holdback gear restriction change oar bearing internal tooth. The utility model discloses a set up the holdback gear on becoming oar bearing internal tooth to when the system failure, it is rotatory to ensure that blade feathering direction can only be faced to the blade, has protected blade and unit effectively.