NOVELTY - Slow release effect tree fertilizer comprises 11-15 pts. wt. peat, 7-9 pts. wt. lignite powder, 13-15 pts. wt. sludge, 67-69 pts. wt. straw, 43-48 pts. wt. sweet potato powder, 64-68 pts. wt. bran, 2-3 pts. wt. amino acid, 9-11 pts. wt. diatomite, 2-3 pts. wt. citric acid, 4-7 pts. wt. ginger powder, 10-13 pts. wt. wood powder, 6-8 pts. wt. effective microorganism (EM) bacterial agent, 11-15 pts. wt. calcium superphosphate, 19-23 pts. wt. potassium sulfate, 27-31 pts. wt. urea, 7-9 pts. wt. soil improving agent, and water (balance). The soil modifying agent comprises e.g. feather powder.    USE - Used as slow release effect tree fertilizer.    ADVANTAGE - The fertilizer promotes plant to absorb nutrition, has slow release function, assures soil fertility, and reduces waste and saves the cost.    DETAILED DESCRIPTION - Slow release effect tree fertilizer comprises 11-15 pts. wt. peat, 7-9 pts. wt. lignite powder, 13-15 pts. wt. sludge, 67-69 pts. wt. straw, 43-48 pts. wt. sweet potato powder, 64-68 pts. wt. bran, 2-3 pts. wt. amino acid, 9-11 pts. wt. diatomite, 2-3 pts. wt. citric acid, 4-7 pts. wt. ginger powder, 10-13 pts. wt. wood powder, 6-8 pts. wt. effective microorganism (EM) bacterial agent, 11-15 pts. wt. calcium superphosphate, 19-23 pts. wt. potassium sulfate, 27-31 pts. wt. urea, 7-9 pts. wt. soil improving agent, and water (balance). The soil modifying agent comprises 10-20 pts. wt. feather powder, 1-2 pts. wt. nano-carbon powder, 4-5 pts. wt. sodium metasilicate, 17-19 pts. wt. methyl methacrylate, 3-4 pts. wt. selenium yeast, 2-3 pts. wt. calcium pantothenate, 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. chitosan, 1-2 pts. wt. Eucalyptus oil, 1-2 pts. wt. zinc oxide, 3-4 pts. wt. wollastonite powder, 10-12 pts. wt. sodium alginate powder, and 3-5 pts. wt. chlorinated paraffin. The preparation of soil modifying agent comprises mixing evenly methyl methacrylate, dipentaerythritol hexaacrylate, chlorinated paraffin and feather powder, nano-carbon powder, Eucalyptus oil, zinc oxide, wollastonite powder, and sodium alginate powder, stirring, heating to 65-75 degrees C, forming mixture, mixing the residual component, stirring to form vinegar liquid mix, mixing the mixture and the edible vinegar mixed liquid, and high speed dispersing into slurry to obtain the product. An INDEPENDENT CLAIM is also included for preparing slow release effect tree fertilizer comprising (i) mixing diatomite, ginger, calcium superphosphate, and potassium sulfate, adding warm water, mixing uniformly, adding soil improving agent, peat, lignite powder, and citric acid, continuously stirring uniformly, high speed dispersing, obtaining slurry, drying and concentrating to prepare granule, (ii) adding the residual component other than urea, mixing uniformly, maintaining the water content at 43-48%, stirring uniformly, sealing, carrying out anaerobic fermentation at room temperature for 21-30 days, turning one time for every 3-5 days, drying to prepare granule, and (iii) heating to melt the urea, mixing step (i) granule and step (ii) granule uniformly, normal temperature cooling and drying to obtain the product.