Preparation method of soybean active peptide

The present invention provides a soybean active peptide preparation method, and relates to the technical field of soybean active peptide preparation, and the method comprises the following steps: S1: preparing soybean protein powder; s2, adjusting the pH value; s3, adding an enzyme; s4, temperature control; s5, a reaction process; s6, filtering, separating, concentrating and purifying; and S7, analyzing and evaluating. In the step S1, when the soybean protein powder is prepared, the specific operation steps are as follows: S1.1, the soybean protein powder is prepared; s1.2, the proportion is determined; s1.3, adding water into the soybean protein powder to form a suspension; and S1.4, soaking is carried out. When the soybean active peptide is prepared and in the reaction process, the pH value and the temperature of the mixed solution can be monitored, the pH value and the temperature of the mixed solution are ensured to be constant when the reaction is carried out, then the optimal pH value and temperature en