Rice polypeptide uses rice protein as raw material, and uses machine equipment to make amino acid polymers linked by peptide bonds by simulating the mode of human body degrading protein. It is a kind of substance composed of amino acids, with smaller molecular weight than protein, simple structure and strong physiological activity. It is mainly composed of a mixture of various polypeptide molecules, as well as other small amounts of free amino acids, sugars and inorganic salts.