NOVELTY - Producing organic fertilizer, by taking individual fish or waste including head, scales, skin, steak or offal as raw materials, crushing, fermenting, adding bacterial composition, dissolving in 2-4 times water, adding complex enzyme, hydrolyzing, centrifuging, passing through 40-100 mesh filter and 600-1000 mesh filter, adding into disc centrifuge, passing through 5-15 micron membrane filtration equipment, purifying, concentrating using three-stage vacuum evaporator, spray-drying to obtain fish protein powder, cooling, and packaging the obtained product.    USE - The method is used for producing organic fertilizer (claimed).    ADVANTAGE - The method is environmentally-friendly.    DETAILED DESCRIPTION - Method for producing organic fertilizer, involves taking individual fish or waste including head, scales, skin, steak or offal as raw materials, crushing the raw materials to size of 0.5-1.5 cm, fermenting the crushed pieces at 25-40 degrees C for 20-24 hours, adding 0.2-0.4 %mass bacterial composition as substrate, where the substrate comprises Bacillus licheniformis, B.subtilis, and B.thuringiensis, dissolving in 2-4 times water, adding 0.1-0.2 wt.% complex enzyme, hydrolyzing at 60-65 degrees C for 8-12 hours, where the complex enzyme comprises papain, cellulase, neutral protease, animal protease, and trypsinase, centrifuging at 800-1200 revolutions per minute (rpm), passing through 40-100 mesh filter and 600-1000 mesh filter, adding into disc centrifuge, passing through 5-15 micron membrane filtration equipment to obtain water-soluble hydrolyzate, purifying the water-soluble hydrolyzate using ion exchange resin column, where the ion exchange resin column comprises acidic ion exchange resin column and basic ion-exchange resin column, the acidic ion exchange resin column is D110 resin containing 5-20% chelating resin, and the basic ion-exchange resin column is D401 resin containing 5-20% chelating resin, concentrating using three-stage vacuum evaporator, where first stage temperature is 90-95 degrees C, vacuum degree is -0.02 to -0.04 MPa, and feed liquid residence time is 20-25 minutes, second stage temperature is 80-85 degrees C, vacuum degree is -0.02 to -0.06 MPa, and feed liquid residence time is 10-20 minutes, and third stage temperature is 60-65 degrees C, vacuum degree is -0.06 to -0.09 MPa, and feed liquid residence time is 20-30 minutes, spray-drying to obtain fish protein powder having moisture content of less than 5%, cooling, and packaging the obtained product.