NOVELTY - Bioorganic coated fertilizer comprises 45-53 pts. wt. wine residue, 55-60 pts. wt. starch, 20-25 pts. wt. soybean meal, 39-44 pts. wt. rice bran, 25-29 pts. wt. ammonium nitrate, 26-33 pts. wt. calcium superphosphate, 2-4 pts. wt. potassium silicate, 15-19 pts. wt. calcium bentonite, 6-9 pts. wt. polyvinyl alcohol, 12-15 pts. wt. wood powder, 19-25 pts. wt. potassium sulfate, 5-7 pts. wt. effective microorganism composition, 8-10 pts. wt. soil improving agent, and water (required amount).    USE - The bioorganic coated fertilizer is useful for improving soil quality.    ADVANTAGE - The fertilizer provides sustained-release effect, enables plant to easily absorb nutrients and water, and improves crop yield and quality.    DETAILED DESCRIPTION - Bioorganic coated fertilizer comprises 45-53 pts. wt. wine residue, 55-60 pts. wt. starch, 20-25 pts. wt. soybean meal, 39-44 pts. wt. rice bran, 25-29 pts. wt. ammonium nitrate, 26-33 pts. wt. calcium superphosphate, 2-4 pts. wt. potassium silicate, 15-19 pts. wt. calcium bentonite, 6-9 pts. wt. polyvinyl alcohol, 12-15 pts. wt. wood powder, 19-25 pts. wt. potassium sulfate, 5-7 pts. wt. effective microorganism composition, 8-10 pts. wt. soil improving agent, and water (required amount). The soil improving agent comprises 10-20 pts. wt. clay, 1-2 pts. wt. nanocarbon powder, 4-5 pts. wt. sodium metasilicate, 17-19 pts. wt. methyl methacrylate, 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 citrate, 1-2 pts. wt. boric acid, 4-6 pts. wt. dipentaerythritol hexaacrylate, 35-40 pts. wt. vinegar, 2-3 pts. wt. chitosan, 1-2 pts. wt. Eucalyptus oil, 3-4 pts. wt. hydroxypropyl methacrylate, 3-4 pts. wt. diatomite, and 2-3 pts. wt. methyltriethoxysilane. The soil improving agent is prepared by mixing methyl methacrylate, dipentaerythritol hexaacrylate, hydroxypropyl methacrylate, clay, nanocarbon powder, Eucalyptus oil, diatomite and methyltriethoxysilane, then adding remaining raw materials to mixture except vinegar, slowly adding and mixing vinegar, and dispersing added materials at high speed to obtain slurry. An INDEPENDENT CLAIM is included for method for preparing the bioorganic coated fertilizer, which involves (a) mixing ammonium nitrate, calcium superphosphate, potassium silicate, wood powder and potassium sulfate with water at room temperature, adding soil improving agent to mixture to obtain slurry, concentrating slurry, drying concentrate, crushing dried product, and granulating product to obtain granule, (b) mixing remaining components except calcium bentonite, fermenting mixture at room temperature under limited oxygen condition for 21-28 days, turning the mixture once in 3-5 days, drying fermentation product, crushing dried product, and preparing granule, and (c) mixing both the granules, drying mixed granule at 75-100 degrees C, dissolving dried granule and calcium bentonite in water to obtain slurry having solid content of 45-55%, concentrating the slurry at 50-55 degrees C, spray drying concentrate to obtain powder, and sifting powder to obtain product.