Provided is a method for producing corn gluten hydrolysate comprising: (a) separating corn gluten protein by removing carbohydrate, water soluble sugars, inorganic materials and fiber material； (b) preparing corn gluten protein lysate by carrying out acid hydrolysis, enzymatic hydrolysis or natural fermentation； and (c) increasing a content of branch chain amino acid (BCAA) which is included in the hydrolysate by isolating, concentrating, precipitating, desalting and filtering the resultant corn gluten protein lysate. With improved pre-treatment and concentration processes as compared with the conventional method, the hydrolysate prepared according to the present invention is rich in amino acids and low-molecular-weight peptides. In particular, free amino acids and branched-chain amino acids (BCAA) are included in large quantity.
