NOVELTY - Bio-organic complex coated slow-release fertilizer comprises 7-9 pts. wt. peat soil, 33-37 pts. wt. castor meal, 30-35 pts. wt. bone powder, 40-44 pts. wt. soybean meal, 26-28 pts. wt. urea, 50-56 pts. wt. potato straw powder, 18-22 pts. wt. ammonium sulfate, 14-18 pts. wt. calcium magnesium phosphate, 1-2 pts. wt. polymeric aluminum sulfate, 6-8 pts. wt. effective microorganism (EM) agent, 1-2 pts. wt. ammonium molybdate, 1-2 pts. wt. borax, 7-9 pts. wt. soil improver.    USE - Used as a bio-organic complex coated slow-release fertilizer.    ADVANTAGE - The fertilizer is non-toxic, decay-resistant and non-hygroscopic, does not agglomerate, has good slow release effect, has nutrition, promotes the plant to absorb nutrients, and ensures lasting fertility, to increase the yield.    DETAILED DESCRIPTION - Bio-organic complex coated slow-release fertilizer comprises 7-9 pts. wt. peat soil, 33-37 pts. wt. castor meal, 30-35 pts. wt. bone powder, 40-44 pts. wt. soybean meal, 26-28 pts. wt. urea, 50-56 pts. wt. potato straw powder, 18-22 pts. wt. ammonium sulfate, 14-18 pts. wt. calcium magnesium phosphate, 1-2 pts. wt. polymeric aluminum sulfate, 6-8 pts. wt. effective microorganism (EM) agent, 1-2 pts. wt. ammonium molybdate, 1-2 pts. wt. borax, 7-9 pts. wt. soil improver, and water; the soil improver includes 10-20 pts. iron slag, 1-2 pts. nano-carbon powder, 4-5 pts. wt. sodium metasilicate, 17-19 pts. wt. aniline methyltriethoxysilane, 3-4 pts. wt. selenium yeast, 2-3 pts. wt. copper sulfate, 2-3 pts. wt. zinc gluconate, 1-2 pts. wt. magnesium chloride, 2-3 pts. wt. ammonium molybdate, 1-2 pts. wt. boric acid, 4-6 pts. wt. dipentaerythritol hexaacrylate, 30-40 pts. wt. vinegar, 2-3 pts. wt. ferrous sulfate, 1-2 pts. wt. Eucalyptus oil, 5-6 pts. wt. hydroxyethyl cellulose, 4-5 pts. wt. jade powder and 2-3 pts. wt. 3-aminopropyl trimethoxysilane; and the preparation of soil improver comprises: evenly mixing aniline methyltriethoxysilane, dipentaerythritol hexaacrylate, iron slag, nano-carbon powder, Eucalyptus oil, hydroxyethyl cellulose, jade powder and 3-aminopropyl trimethoxysilane, and heating to 65-75 degrees C to form a mixture; mixing the remaining ingredients, stirring to form a vinegar mixture; and mixing the vinegar mixture with the above mixture, and high-speed dispersed into a slurry. An INDEPENDENT CLAIM is also included for preparing the bio-organic complex coated slow-release fertilizer, comprising (i) mixing ammonium sulfate, calcium magnesium phosphate, polymeric aluminum sulfate, polymeric ferric sulfate, ammonium molybdate and borax, adding warm water, mixing with soil improver and peat soil, continuing stirring, high speed dispersing into slurry, and concentrating to dryness, to obtain particles; (ii) mixing the remaining components other than urea, maintaining 43-46% moisture content, stirring, sealing, carrying out anaerobic fermentation for 21-28 days at room temperature, turning once every 4-5 days, and drying to obtain particles; (iii) uniformly mixing the particles of step (i) and step (ii), and adding into a drum type granulator, adding urea, heating and melting urea, so as to form a coating on the outer surface of the mixed particles, then hot air drying at 65-75 degrees C, and air cooling to room temperature.