Using starch or starch as raw material, the glucose solution obtained by liquefaction and saccharification is refined, concentrated, cooled and crystallized to obtain a white powdery product containing one water molecule. Glucose monohydrate is a carbohydrate that can be directly absorbed and utilized to supplement heat energy, and is the main source of energy required by the human body. It is used as a sweetener, nutrient and filler in the food industry and beverage industry.