NOVELTY - Coated biological fertilizer is prepared by utilizing 30-35 pts. wt. cereal particles, 52-58 pts. wt. sludge, 14-17 pts. wt. shrimp powder, 11-14 pts. wt. potassium sulfate, 23-26 pts. wt. ammonium nitrate, 1-2 pts. wt. copper sulfate, 1-2 pts. wt. zinc sulfate, 2-3 pts. wt. lignin sulfonate, 7-10 pts. wt. nanocarbon particles, 16-23 pts. wt. phosphate fertilizer, 14-16 pts. wt. expanded vermiculite powder, 0.4-0.7 pts. wt. silicon liquid, 7-14 pts. wt. paraffin, 4-6 pts. wt. effective microbes, 8-11 pts. wt. soil improving agent and balanced amount of water.    USE - Coated biological fertilizer.    ADVANTAGE - The coated biological fertilizer is eco-friendly, increases yield and quality of crops.    DETAILED DESCRIPTION - Coated biological fertilizer is prepared by utilizing 30-35 pts. wt. cereal particles, 52-58 pts. wt. sludge, 14-17 pts. wt. shrimp powder, 11-14 pts. wt. potassium sulfate, 23-26 pts. wt. ammonium nitrate, 1-2 pts. wt. copper sulfate, 1-2 pts. wt. zinc sulfate, 2-3 pts. wt. lignin sulfonate, 7-10 pts. wt. nanocarbon particles, 16-23 pts. wt. phosphate fertilizer, 14-16 pts. wt. expanded vermiculite powder, 0.4-0.7 pts. wt. silicon liquid, 7-14 pts. wt. paraffin, 4-6 pts. wt. effective microbes, 8-11 pts. wt. soil improving agent and balanced amount of water. Soil improving agent comprises 10-15 pts. wt. zinc sulfate, 10-15 pts. wt. medicinal stone, 10-15 pts. wt. Stemona tuber powder, 10-15 pts. wt. garlic powder, 0.2-0.3 pts. wt. nanocarbon particles, 0.4-1.0 pts. wt. sodium silicate, 1-2 pts. wt. silane coupling agent KH-550, 10-12 pts. wt. ferrous sulfate, 0.4-0.8 pts. wt. ethyl orthosilicate, 3-6 pts. wt. chlorinated paraffin, 1-2 pts. wt. bamboo fiber, 0.3-0.6 pts. wt. selenium yeast, 1-2 pts. wt. oyster shell nanopowder, 1-2 pts. wt. borax, 1-2 copper sulfate and 2-3 pts. wt. chitosan. Soil improving agent is prepared by grinding raw materials, granulating, and then stirring at speed of 1200-1400 revolutions per minute for 30 minutes to obtain granules. Granules are rolled in cloth, and chlorinated paraffin is heated at 45-50 degrees C to melt it. Molten chlorinated paraffin is sprayed on surface of granules, and then dried at room temperature. An INDEPENDENT CLAIM is included for a method for preparing coated biological fertilizer, which involves:    (A) mixing cereal particle, sludge and effective microbes microbial inoculum uniformly to maintain water content 42-44%;    (B) stirring the mixture uniformly, and then fermenting in sealed non-oxygen supplying system at low temperature for 24-28 days to obtain fermented product;    (C) mixing shrimp shell meal, nanocarbon and expand vermiculite powder with fermented product with stirring uniformly, and then drying to obtain granules;    (D) adding remaining components at 50-60 degrees C for 20-40 minutes and adding soil improving agent; and    (E) melting paraffin wax, coating it on granules, and then cooling to obtain final product.