Preparation method of pecan polypeptide and application of pecan polypeptide

The invention discloses a pecan polypeptide preparation method, which comprises: 1) pecan kernel pretreatment: carrying out pretreatment on pecan kernels to obtain degreased pecan powder; (2) preparing pecan protein: adding sodium chloride into water to prepare a sodium chloride solution with the concentration of 0.05-0.25 mol/L, then adding the degreased pecan powder in the step (1), mixing to obtain feed liquid, and preparing the pecan protein by adopting an alkali extraction and acid precipitation method; 3) pecan protein enzymolysis: adding the pecan protein in the step 2) into water, mixing, adding protease for hydrolysis, enzyme deactivation and filtration to obtain pecan polypeptide; the dosage ratio of the pecan protein to the water is 1g: (5-20) mL. Meanwhile, the invention provides an application of the pecan polypeptide in drunkenness relieving drinks. In an alkaline environment, the pecan functional protein is specifically hydrolyzed through alkaline protease, the hydrolysis degree is high, and th