The invention discloses an alcohol production method, which comprises the following steps of: (1) respectively carrying out liquefaction and saccharification on farinaceous size, and fermenting a saccharification liquid obtained by saccharification to obtain CO2-containing gas component A and a fermented liquor; (2) letting the CO2-containing gas component A contact with a washing liquid, washing, dissolving ethanol from the CO2-containing gas component A in the washing liquid to obtain a complete liquid; and carrying out solid-liquid separation on the fermented liquor to obtain a fermented clear liquid; (3) carrying out distillation on the complete liquid and the fermented clear liquid to obtain a gaseous distillate B, condensing the gaseous distillate B until ethanol is a liquid state, so as to obtain a liquid ethanol fraction C and a gas component D; and (4) letting the gas component D contact with water, and washing to obtain a washed liquid E. The invention is characterized in that the washing liquid comprises the washed liquid E and the concentration of ethanol in the washing liquid is not higher than 2.5% (volume). The alcohol production method provided by the invention is used to raise ethanol yield and reduce cost.