The invention discloses a production process of high-purity malt syrup, which comprises the following steps: S1,
starch is subjected to size mixing and
liquefaction, and the DE value of
liquefaction is controlled at 1-2%; s2, controlling the temperature of the liquefied liquid to 55-60 DEG C, controlling the pH value to 4.2-7.2, and adding debranching
enzyme and beta
amylase for saccharification treatment; s3, after saccharification is completed,
ethanol is added until the concentration is 20%, the reaction continues for 2 h, the
ethanol concentration is increased to 40%, and the reaction continues for 2 h; s4, cooling to 30-35 DEG C, adding
ethanol until the concentration is 80%, carrying out
enzyme deactivation, and standing for
crystallization; and S5, centrifugally separating the
crystal substance, and
drying to obtain the
maltose. Through the design of multienzyme
synergy, step-by-step enzymolysis, ethanol denaturation and the like, the purity and the yield of the
maltose product are greatly improved.