The invention discloses a redundant feathering system and method for controlling wind power variable pitch. The redundant feathering system for controlling wind power variable pitch comprises three shaft cabinets, the output ends of a main power supply and a backup power supply are connected with a driver and a motor power input ends; a backup power selector is provided with three alternative interfaces, a first interface is connected with a shaft cabinet driver, a second interface is connected with the next shaft cabinet driver, a third interface is connected with the former shaft cabinet driver; the signal input end of the backup power supply selector is connected with the output end of a controller; three alternative interfaces are arranged in a servo motor selector, the first interfaceof the servo motor selector is connected with a shaft cabinet motor, the second interface of the servo motor selector is connected with the next shaft cabinet motor, the third interface of the servomotor selector is connected with the former shaft cabinet motor; and the control signal input end of the servo motor selector is connected with the output end of the controller. On the basis of addinga small number of circuit switching equipment, the key components between the shaft cabinets can be shared through the backup power selector and the servo motor selector so that the feathering operation can be completed.