The invention provides a fan paddle-changing system which is a concentrating paddle-changing system, and the fan paddle-changing system comprises a paddle-changing driving device, a synchronized driving device and a paddle-changing bearing, wherein the paddle-changing bearing is arranged on the hub surface of a fan, and the outer ring of the paddle-changing bearing is correspondingly provided with a blade; one end of the synchronized driving device is connected with the output shaft of the paddle-changing driving device, the other end of the synchronized driving device is provided with a plurality of synchronized rotating shafts arranged corresponding to the inner ring of the paddle-changing bearing; and the output shafts of the paddle-changing driving device and a fan gear case are provided with normally open clutches, when the paddle-changing driving device loses efficacy, each clutch is closed. Compared with the high-power wind generating set, the paddle-changing system provided by the invention has good applicability, can perform the blade paddle-changing movement under a fan normal operating condition, and also can enable the blade to reliably return to a feathering position when the fan has a fault, thereby guaranteeing the safe operation of the fan.