A small molecular peptide obtained by using soybean protein as raw material, directed bio- enzyme cutting technology, and advanced separation technology. Compared with ordinary soybeans, soybean peptide are more easily absorbed by the body without increasing the burden on the digestive organs. The protein is more than 90%, and the 8 amino acids necessary for the human body are complete. soybean peptide has good nutritional properties and is a promising functional food raw material.