NOVELTY - Separating and extracting amino acid product from protein hydrolysis liquid comprises e.g. adding acid to protein, heating, performing acid or adding protease for hydrolyzing to obtain amino acid mixed solution, diluting with water, flowing through I type activated carbon adsorption chromatographic column, using water for washing the chromatographic column, flowing mixed solution of ethanol-hydrochloric acid through the chromatographic column, washing the mixed solution of ethanol and hydrochloric acid, collecting washed liquid, distilling, recovering ethanol, and collecting resulting liquid.    USE - The method is useful for separating and extracting amino acid product from protein hydrolysis liquid (claimed).    ADVANTAGE - The method: increases the number of varieties and single amino acid yield; recycles water; and achieves environmentally-friendly wastewater discharge requirements.    DETAILED DESCRIPTION - Separating and extracting amino acid product from protein hydrolysis liquid comprises adding acid to protein, heating, performing acid or adding protease for hydrolyzing to obtain amino acid mixed solution, using water to dilute, flowing through the I type activated carbon adsorption chromatographic column, using water for washing the chromatographic column, flowing mixed solution of ethanol-hydrochloric acid through the chromatographic column, washing the mixed solution of ethanol and hydrochloric acid, collecting the washed liquid, distilling, recovering ethanol, collecting the resulting liquid, using alkali to neutralize to pH to 5-6, allowing to stand, crystallizing, centrifuging, and filtering to obtain most precipitate i.e., tyrosine, centrifuging and filtering the filtrate containing tyrosine and phenylalanine, using alkali to neutralize to pH to more than 7, then flowing through III type activated carbon adsorption chromatographic column, separating to obtain phenylalanine, tyrosine and/or tryptophan, then flowing through the I type activated carbon adsorption chromatographic column, adjusting the pH of the amino acid mixed solution to more than 7, then flowing through II type activated carbon adsorption chromatographic column, using water for washing, releasing hydrochloric acid, collecting washing liquid to obtain bright component, preserved component, component separation solution, finally separating the solution to obtain cystine, arginine, histidine, methionine, isoleucine, leucine, proline, valine, lysine, aspartic acid, glutamic acid, threonine, serine, alanine and glycine. An INDEPENDENT CLAIM is also included for device for separating and extracting amino acid product from protein hydrolysis liquid, comprising a reaction vessel for adding acid to protein, heating, performing acid or adding protease for hydrolyzing to obtain amino acid mixed solution, which is connected to a first liquid storage tank. The storage tank is set with a water inlet for adding water to dilute the mixed solution. The inlet of the storage tank is connected to I type activated carbon adsorption chromatographic column, and an outlet is connected with a first collecting jar and a second liquid storage tank. The chromatographic column is also set with an inlet of water and hydrochloric acid-ethanol mixed solution, which adds water for releasing ethanol-hydrochloric acid nixed solution from the column. The first collecting jar is used for collecting washed water used for washing ethanol-hydrochloric acid mixed solution. The outlet of the first collecting jar is connected with a distiller for distilling and recovering ethanol. The distiller is connected to a first crystallizing jar for crystallizing, and then flowing into the tank. The crystallizing jar is set with a feeding inlet of aqueous ammonia for adjusting the pH to 5-6, separating tyrosine, and crystallizing. The inlet of centrifuge is connected to the outlet of the crystallizing jar, used for separating the crystal solid tyrosine. The outlet of the centrifuge is connected with a third liquid storage tank for storing the centrifugally separated filtrate. The inlet of the third liquid storage tank is also set with aqueous ammonia inlet for adding aqueous ammonia to adjust pH to more than 7. The storage tank is connected to the inlet of III type activated carbon adsorption chromatographic column for separating phenylalanine, tyrosine and/or tryptophan. The second liquid storage tank is set with the aqueous ammonia inlet for adding the aqueous ammonia to adjust pH to more than 7. The inlet of II type activated carbon adsorption chromatographic column is connected with the second liquid storage tank. The chromatographic column is further set with the inlet of water and hydrochloric acid for successively adding water to release hydrochloric acid from the chromatographic column, then separating bright component separating solution, preserved component separating solution and third component separating solution. The inlet of fourth liquid storage tank is connected to the outlet of cationic resin column. The cation resin column is set with ammonium hydroxide inlet for adding ammonium hydroxide, separating solution to obtain methionine, cystine, arginine, histidine, leucine and isoleucine. A seventh liquid storage tank is used for collecting leucine and isoleucine separating solution. The storage tank is set with aqueous ammonia inlet for adding aqueous ammonia to adjust pH to 6-6.5. The inlet of the III type chromatographic column is connected with the seventh liquid storage tank for separating leucine and isoleucine. The fifth liquid storage tank is used for collecting preserved component separating solution and is set with aqueous ammonia for adding aqueous ammonia to adjust pH to 9-10. The outlet of the fifth liquid storage tank is connected to the inlet of first anion resin column. The first anion resin column is also set with water inlet for releasing from first anion resin column by adding water, and separating proline, valine and lysine. The sixth liquid storage tank is used for collecting and separating solution of propylene component. The sixth liquid storage tank is set with aqueous ammonia water inlet for adding aqueous ammonia to adjust pH to 9-10. The outlet of the sixth liquid storage tank is connected with the inlet of second anion resin column provided with inlet for releasing hydrochloric acid from the column by adding water, separating the separation solution of glycine and alanine, serine and threonine separating solution, separating solution of aspartic acid and glutamic acid. An eighth liquid storage tank is used for collecting and separating the solution of glycine and alanine.