NOVELTY - Special complex coated base fertilizer comprises 80-90 pts. wt. river mud, 120-130 pts. wt. hay, 50-60 pts. wt. leaves, 35-50 pts. wt. rape straw, 45-55 pts. wt. soybean straw, 25-30 pts. wt. monoammonium phosphate, 2-4 pts. wt. copper sulfate, 1-2 pts. wt. zinc phosphate, 12-14 pts. wt. cellulose acetate, 35-40 pts. wt. soybean meal, 16-25 pts. wt. potassium sulfate, 9-15 pts. wt. fly ash, 6-8 pts. wt. effective microorganisms, 8-10 pts. wt. soil improving agent, and water (suitable quantity).    USE - The special complex coated base fertilizer is useful for agricultural crops (claimed).    ADVANTAGE - The special complex coated base fertilizer satisfies nutritional requirement of the agricultural crops, has slow release property, provides prolonged effect and improves soil quality.    DETAILED DESCRIPTION - Special complex coated base fertilizer comprises 80-90 pts. wt. river mud, 120-130 pts. wt. hay, 50-60 pts. wt. leaves, 35-50 pts. wt. rape straw, 45-55 pts. wt. soybean straw, 25-30 pts. wt. monoammonium phosphate, 2-4 pts. wt. copper sulfate, 1-2 pts. wt. zinc phosphate, 12-14 pts. wt. cellulose acetate, 35-40 pts. wt. soybean meal, 16-25 pts. wt. potassium sulfate, 9-15 pts. wt. fly ash, 6-8 pts. wt. effective microorganisms, 8-10 pts. wt. soil improving agent, and water (suitable quantity), where the soil improving agent comprises 10-20 pts. wt. sepiolite, 1-2 pts. wt. nanocarbon powder, 4-5 pts. wt. sodium metasilicate, 17-19 pts. wt. methyl methacrylate, 3-4 pts. wt. selenium, 2-3 pts. wt. copper, 2-3 pts. wt. zinc, 1-2 pts. wt. magnesium chloride, 2-3 pts. wt. ammonium citrate, 1-2 pts. wt. boric acid, 4-6 pts. wt. dipentaerythritol hexaacrylate, 30-40 pts. wt. vinegar, 2-3 pts. wt. chitosan, 1-2 pts. wt. Eucalyptus oil and 0.5-1 pts. wt. sodium nitrophenolate. The soil improving agent is prepared by mixing the methyl methacrylate, dipentaerythritol hexaacrylate, sepiolite, nanocarbon powder and Eucalyptus uniformly, forming a uniform mixture, mixing the remaining raw materials to form a solution, combining the mixture and solution together, dispersing at high speed into slurry to obtain product. An INDEPENDENT CLAIM is included for method for preparing the fertilizer, which involves uniformly mixing the river mud, monoammonium phosphate, copper sulfate, zinc phosphate, potassium sulfate, fly ash and water (suitable quantity), adding the soil improving agent, continuing stirring to obtain slurry, drying to obtain a granule, mixing the remaining raw materials except cellulose acetate uniformly, maintaining moisture content to 40-45%, stirring uniformly, sealing, fermenting under anaerobic condition at room temperature for 20-30 days, drying and crushing to prepare granule, combining the obtained granules and cellulose acetate, mixing uniformly, cooling to room temperature and drying to obtain product.