NOVELTY - Forming ethanol by fermentation of potato raw material using potato saccharification sand-removing process involves crushing raw material, carrying out pre-enzymolysis, after liquefaction, passing material to pre-heating tower, passing to flash tank, passing to saccharifying tank and adding maltogenic amylase, subjecting to solid-liquid separation, passing liquid phase into secondary buffer tank and solid phase in washing groove, washing material, subjecting solid phase to drying and liquid phase to mixing tank, passing liquid phase from buffer tank into cooler, sterilizing, and cooling.    USE - For producing ethanol by fermentation of potato raw material (claimed), where ethanol is used as fuel and as petrochemical resource.    ADVANTAGE - The method not only removes fine sand in the raw material but also effectively uses heat, avoids need for cooling water, easily removes sand, is energy-saving and water-saving. The method saves energy; uses heat that can be recycled; and improves the utilization rate of the fermentation device.    DETAILED DESCRIPTION - Producing ethanol by fermentation of potato raw material using potato saccharification sand-removing process involves crushing the raw material in material tank, using second-stage separation machine for separating the liquid phase and mixing as ingredient water, adding amylase and subjecting to pre-enzymolysis, after enzymolysis, passing material to pre-heating tower for pre-heating, sending material to first level buffer tank after pre-heating, passing temporarily into injection liquefier, then passing to first level maintaining tank maintained for certain time, then passing to flash evaporation tank, after flash evaporation, passing the material to saccharifying tank, passing flash generated by secondary steam as the heating medium to preheating tower, and condensing other part by using condenser, heating the material from ingredient water as heating medium and passing to secondary cooler, passing material to saccharifying tank, adding maltogenic amylase to saccharify, then passing to first level separating machine for solid-liquid separation, passing the separated liquid phase into secondary buffer tank, passing the separated solid to washing groove, adding water to wash the material in condenser, after washing, passing the material into second-stage separation mechanism for solid-liquid separation, passing the separated solid phase to secondary de-drying section, subjecting the material to second-stage separation, mixing the liquid in aqueous phase mixing tank, passing the liquid phase from buffer tank into first grade cooler as cooling medium, pre-heating material and allowing preheated material to enter into continuous sterilizer, and then passing material to secondary maintaining tank maintained for certain time, then passing the material into the first and second grade coolers to cool, after cooling in secondary cooler, fermenting the material for preparing water, where prepared water after being heated in condenser is used as the cooling medium.