The invention provides a method for fermenting functional wheat bran. The method comprises the following steps: (1) aspergillus niger is subjected to slant culture, shaking primary culture and shaking secondary culture to obtain aspergillus niger secondary seed solution; (2) microzyme is subjected to slant culture, shaking primary culture and shaking secondary culture to obtain microzyme secondary seed solution; and (3) the aspergillus niger secondary seed solution and the microzyme secondary seed solution are introduced into a fermentation medium prepared by the wheat bran to be fermented, and are finally dried to obtain the functional wheat bran. The functional wheat bran removes various anti-nutritional factors in a vegetable protein raw material, is rich in high-activity wheat bran dietary fiber and high-activity protein, generates small peptide and lactic acid simultaneously when the wheat bran is used, and is easily absorbed by an organism, so that the wheat bran is a high-quality health-care product. The wheat bran realizes effective value addition and utilization of wheat bran while providing health food for people, and has significant social benefit and economical benefit.