The old-style flour milling machine is a relatively simple device, if the workload is too large, the machine is overloaded, then there will be a high failure rate, but also shorten the service life. Currently on the market, the construction of the pulverizer and crushing and filtering technology can improve the processing efficiency, there are multi-stage crushing and extrusion, cleaning and filtering and other cyclic processes, starch rate is relatively high. So in the preliminary stage of the investigation is generally to choose a large processing capacity, high efficiency sweet potato flour milling machine.