Biological manufacturing method for utilizing waste feathers to produce amino acid liquid fertilizer

The invention discloses a method for utilizing waste feathers to produce amino acid liquid fertilizer. The method comprises the steps of carrying out enzymolysis on feather powder through compound enzyme to obtain enzymolysis liquid, adding acid protease into the enzymolysis liquid for enzymolysis, filtering the liquid after enzymolysis is finished, and carrying out enzyme inactivation on a filtrate to obtain the amino acid liquid fertilizer. The compound enzyme comprises keratinase and amino acid peptidase. According to the method, the enzymolysis rate of the feathers can reach 80% or above,the prepared amino acid liquid fertilizer contains 17 kinds of amino acids, the variety is complete, the content of the amino acids can reach 10.12% or above (mass fraction), the content of small peptide can reach 9.39% (mass fraction), and the method can meet the national standard for the amino acid liquid fertilizer without concentration. Therefore, the environment-friendly amino acid liquid fertilizer can be prepared.