NOVELTY - Preparation of biological organic fertilizer from lysine waste mother liquor involves solid-liquid separating solid fiber material, upper layer liquid and cell wall to obtain supernatant and precipitate, mixing precipitate, flour, rice bran, egg shell powder and wheat bran, adding ammonia water, ammoniating, adding cellulase and xylanase, performing enzymolysis, drying, crushing, adding potassium humate, diatomite, zeolite, bean pulp and peat to supernatant, adding ammonia water, stirring, ammoniating, mixing with monoammonium phosphate, polyaspartic acid and zinc sulfate, and granulating.    USE - Method for preparing biological organic fertilizer from lysine waste mother liquor (claimed).    ADVANTAGE - The method has no waste production, good environmental protection, high product purity and produces high-protein feed.    DETAILED DESCRIPTION - Preparation of biological organic fertilizer from lysine waste mother liquor comprises:    (A) filtering lysine fermentation liquid by 1-mm filtering film, collecting filtrate A and solid fiber material, filtering filtrate A by microfiltering film, collecting retentate and filtrate B, filtering filtrate B by ultrafiltering film, collecting concentrated liquid and filtrate C, evaporating concentrated filtrate, centrifuging, collecting threonine crystal and waste liquid, and combining retentate, concentrated liquid and waste liquid to obtain waste mother liquor;    (B) heating waste mother liquor to 100 degrees C, preserving heat for 10 minutes to obtain bacteria solution, cooling to room temperature, centrifuging in disk-type centrifuge at rotary speed of 4000 revolutions/minute (rpm) for 12 minutes, collecting lower layer bacteria and upper layer liquid, vacuum-drying bacteria at 40 degrees C, UV irradiating for 5 minutes, adding to reactor, adding 1 M hydrochloric acid solution, stirring at speed of 100 rpm for 15 minutes, centrifuging at 3000 rpm for 5 minutes, removing cell wall, collecting supernatant, concentrated into paste and spray-drying in granulating fluidization bed;    (C) solid-liquid separating solid fiber material, upper layer liquid and cell wall to obtain supernatant and precipitate, mixing precipitate, flour, rice bran, egg shell powder and wheat bran at mass ratio of 5: 2: 1: 1: 1, adding 3% ammonia water, adding purified water to adjust water content to 50%, uniformly mixing, ammoniating for 72 hours, adjusting pH to 5.0, adding 2% cellulase and 1% xylanase, uniformly mixing, performing enzymolysis at 100 degrees C for 20 hours, enzyme deactivating for 5 minutes, drying at 30 degrees C and crushing to obtain cattle feed; and    (D) adding potassium humate, diatomite, zeolite powder, bean pulp and peat to supernatant, uniformly stirring, standing for 12 hours, adding ammonia water, uniformly stirring, ammoniating for 72 hours to obtain main material, uniformly mixing main material, monoammonium phosphate, polyaspartic acid and zinc sulfate at mass ratio of 200: 10: 1: 1, adding to double-screw extruding and granulating machine, granulating and packaging to obtain fertilizer.