The invention discloses a combined asynchronous supporting gear structure. The structure includes a supporting wheel and a gear which are arranged coaxially on a rotating shaft, an asynchronous structure is arranged between the supporting wheel and the rotating shaft and includes a bearing fixedly sleeving the corresponding portion of the rotating shaft, the supporting wheel sleeves the bearing, and the inner ring of the supporting wheel is tightly matched with the outer ring of the bearing. Asynchronous rotation of the supporting wheel and the gear can be achieved, and the frictional wear ofthe supporting wheel is reduced.