NOVELTY - Production of polypeptide protein, amino acid protein powder includes taking fresh or frozen porcine or bovine lung extract sodium heparin, crushing into slurry, adding non-ionic surfactant, stirring, filtering to obtain first filtrate and residue; adding first residue in deionized water, mixing, adding sodium chloride, adjusting pH, stirring, reacting, extracting, filtering to obtain second filtrate and residue; mixing first and second filtrates, adding protease, stirring, adjusting pH, hydrolyzing to obtain enzymatic liquid; adding protein denaturing agent, stirring, precipitating, and centrifuging.    USE - Method for producing polypeptide protein, amino acid protein powder (claimed).    ADVANTAGE - The method is simple and suitable for large scale production, does not discharge waste gas, wastewater and waste residue to pollute the environment, and has short production period and high yield.    DETAILED DESCRIPTION - Production of polypeptide protein, amino acid protein powder comprises taking fresh or frozen porcine or bovine lung extract sodium heparin, crushing into slurry, adding non-ionic surfactant at weight ratio of 0.4-0.6:1, stirring for 25-35 minutes, and filtering to obtain first filtrate and residue; adding first residue in 0.5-1.5 times deionized water, mixing, adding 2-4 wt.% sodium chloride, adjusting pH to 8-9, controlling temperature at 40-60 degrees C, stirring, reacting for 3-5 hours, extracting, and filtering to obtain second filtrate and residue; mixing first and second filtrates, adding 0.05-0.15 wt.% protease, controlling temperature at 48-52 degrees C, stirring, adjusting pH to 8.5-9, and hydrolyzing for 3.5-4.5 hours to obtain enzymatic liquid; controlling temperature at 45-50 degrees C, adding 0.4-0.6 g protein denaturing agent, stirring, precipitating for 25-35 minutes, centrifuging, drying using 5KD ultrafiltration to obtain 5KD liquid and precipitate, concentrating 5KD liquid to 10-20% concentrated liquid, adjusting pH to 4.5-6.5, controlling salinity to 3%, adding sodium acetate buffer solution at volume ratio of 100:0.5-1.5, balancing using weak alkali anion exchange resin column, and absorbing; drying, eluting with sodium chloride solution, adding 7-14 wt.% heparin sodium solution as eluent, adjusting pH to 7-7.5, and drying to obtain crude heparin sodium; mixing second residue and precipitate with 1 time water, adjusting pH to 8-9, adding 0.3 wt.% animal protease, controlling temperature at 45-50 degrees C, enzymolyzing for 3.5-4.5 hours, adding activated carbon at mass ratio of 2-3:100, stirring for 50-70 minutes, filtering off activated carbon, adjusting pH of filtrate to 7, evaporating, and drying to obtain polypeptide protein powder; mixing 5KD liquid with concentrated liquid resin, absorbing, adjusting pH to 6.5-7, performing 200D nanofiltration, desalinating until salinity of 0.1-0.3%, concentrating to 8-12% to obtain amino acid protein powder, spray drying, and recycling waste salt solution for desalination.