The invention discloses an ultrasonic-assisted double-enzyme hydrolysis technology of starch and belongs to the technical field of enzymolysis of starch. The ultrasonic-assisted double-enzyme hydrolysis of starch is especially applied in the invention. According to the method, ultrasonic wave is added in starch liquefaction and glucoamylase hydrolysis processes, under the conditions that the ultrasonic power is 100W, the ultrasonic time is 10 minutes and the concentration of starch milk is 20%, the liquification value of starch milk and DE (Dextrose Equivalent) value are respectively improved from 19.89mg/mL and 82.06%, which are obtained from starch milk untreated by ultrasonic wave, to 30.67mg/mL and 94.30%. Since starch particles are subjected to ultrasonic treatment, dents and cracks on the surface of the starch particles are significantly increased, the crystalline structure of starch is destroyed, the infrared crystallinity index is decreased, the starch branched structure is destroyed, the content of amylase is increased and thus the solubility is improved by 246.8%. Furthermore, due to the activation effect of ultrasonic treatment on the enzyme, the activity of alpha-amylase is improved by 15.29%.