Preparation method of wheat protein peptide

The invention relates to a preparation method of wheat protein peptide, belonging to the technical field of feed processing. The preparation method comprises the following steps: with wheat protein powder as a raw material, firstly adding water and mixing until the concentration of the raw material is 5%-10%, then regulating the pH value to be 5-6, regulating the temperature to be 50 DEG C-60 DEG C, adding papain at twice (the enzyme activity is two million units per gram), controlling the use amount of the papain at 0.0013 g per each gram of the wheat protein powder, adding the papain equal to 65% of the total enzyme quantity in the beginning of hydrolysis, after carrying out the hydrolysis for 2 hours, adding the rest papain equal to 35% of the total enzyme quantity and then carrying out the hydrolysis for 4-6 hours, and degrading the raw material into small peptide; and after finishing fermentation, boiling for 5 minutes and carrying out enzyme deactivation, then filtering, concentrating the filter liquid