Preparation method of modified cottonseed protein

The invention relates to a preparation method of modified cottonseed protein, and belongs to the technical field of feed raw material pre-digestion treatment. The method comprises the following steps: obtaining an alkaline suspension; executing a first enzymolysis stage, namely adding first protease into the alkaline suspension for enzymolysis; the activity of the first protease is 200000 U/g; executing a second enzymolysis stage, namely adding second protease into the alkaline suspension for enzymolysis; the activity of the second protease is 360000 U/g; executing a third enzymolysis stage, and continuously adding the first protease into the alkaline suspension for enzymolysis; executing a fourth enzymolysis stage, and adding third protease into the alkaline suspension for enzymolysis; the activity of the third protease is 480000U/g; and after the enzymolysis is completed, preparing and generating a modified cottonseed protein product. According to the preparation method of the modified cottonseed protein pr