NOVELTY - Industrially producing L-tyrosine by using poultry feather as raw material comprises adding prepared poultry feather to hydrochloric acid, heating and hydrolyzing to obtain hydrolyzed mixed solution, then separating to obtain the hydrolyzed separated solution, adding pure alkali, heating and neutralizing to obtain neutralized solution, then separating and decoloring, and evaporating and condensing the neutralized separated solution, then crystallizing and separating the condensed solution to obtain wet L-tyrosine crystallization and drying wet L-tyrosine crystallization to obtain L-tyrosine.    USE - The method is useful for producing L-tyrosine by using poultry feather as raw material.    ADVANTAGE - The method: reduces reaction time, thus shortens production period; eliminates the problems of low decomposition rate and incomplete decomposition; improves oxidation resistance capability of the product; prolongs product storage period and improves raw material yield (40%); reduces pollution of the waste poultry feather; and increase poultry process value (300-350% from 120%). The obtained product is purely natural and safe without toxin.    DETAILED DESCRIPTION - Industrially producing L-tyrosine by using poultry feather as raw material comprises (i) adding prepared poultry feather to hydrochloric acid, heating and hydrolyzing to obtain hydrolyzed mixed solution, (ii) separating the hydrolyzed mixed solution for the first time to obtain the first hydrolyzed separated solution, (iii) adding pure alkali to the first hydrolyzed separated solution, heating and neutralizing for the first time to obtain the first neutralized solution where the precipitation in the first neutralized solution is other amino acids, and the solute in the first neutralized solution is L-tyrosine including little cystine impurity, (iv) separating for the second time, decoloring for the first time and neutralizing for the second time of the first neutralized solution to obtain second neutralized solution, (v) separating for the third time, and decoloring for the second time and neutralizing for the third time of the second neutralized solution to obtain third neutralized solution, (vi) separating for the fourth time, and decoloring for the third time and neutralizing for the fourth time of the third neutralized solution to obtain fourth neutralized solution, (vii) after separating the fourth neutralized solution for the sixth time to obtain fourth neutralized separated solution, and (viii) after evaporating and condensing the fourth neutralized separated solution, obtaining condensed solution, after crystallizing and separating the condensed solution, obtaining wet L-tyrosine crystallization, and after drying wet L-tyrosine crystallization to obtain L-tyrosine.