Disclosed is a novel diffusion furnace battery piece conveying device, comprising a central shaft and a synchronizing wheel. A fixing surface is arranged on an outer side wall of a mounting end of the central shaft, and two ends of the mounting end of the central shaft are rotatably inserted into a left mounting frame and a right mounting frame respectively. The synchronizing wheel is sleeved on the mounting end of the central shaft between the left mounting frame and the right mounting frame. An insertion hole penetrates through the synchronizing wheel, a drilling hole is formed in the fixing surface in correspondence to the insertion hole, a jackscrew is inserted into the insertion hole, and an end, close to the mounting end of the central shaft, of the jackscrew extends into the drilling hole. By changing a fixing manner of the synchronizing wheel, the fixing surface of the central shaft capable of more firmly fixing the synchronizing wheel is designed, the drilling hole is formed in the surface of the fixing surface, the jackscrew is inserted into the insertion hole of the synchronizing wheel and extends into the drilling hole, and therefore the synchronizing wheel can be effectively prevented from shifting leftwards and rightwards. Thus, a situation of a pusher overload alarm of a diffusion furnace is avoided, the downtime of the diffusion furnace is reasonably shortened, and therefore the yield during diffusion of silicon wafers can be improved.