NOVELTY - Organic fertilizer comprises oyster shell powder, dry chicken manure, yellow sand, nano-iron ore tailings, corncob, vermicompost, agar, effective microorganism (EM), potassium sulfide, calcium chloride, calcium hydrogen phosphate, urea, ammonium molybdate, auxiliary agent and water. The auxiliary agent comprises zinc gluconate, nano-carbon powder, Ammopiptanthus nanus oil, maifanite powder, ammonium persulfate, nano-iron ore tailings, methyl methacrylate, borax, glycerin and water.    USE - The organic fertilizer is useful for cultivation of grape vines (claimed) and fertilizing soil.    ADVANTAGE - The organic fertilizer is rich in nutritional components, exhibits sustained-release property, loosens soil, and improves rooting of grapevines. The method is environmentally-friendly to perform, enables reutilization of waste, and recycles natural substances. The repeated application of fertilizer is avoided. The usage of chemical substances is reduced.    DETAILED DESCRIPTION - Organic fertilizer comprises 6-8 pts. wt. oyster shell powder, 8-12 pts. wt. dry chicken manure, 9-13 pts. wt. yellow sand, 12-14 pts. wt. nano-iron ore tailings, 12-14 pts. wt. corncob, 7-10 pts. wt. vermicompost, 1-2 pts. wt. agar, 2-3 pts. wt. effective microorganism (EM), 5-7 pts. wt. potassium sulfide, 2-3 pts. wt. calcium chloride, 4-6 pts. wt. calcium hydrogen phosphate, 10-14 pts. wt. urea, 3-4 pts. wt. ammonium molybdate, 4-5 pts. wt. auxiliary agent and suitable amount of water. The auxiliary agent comprises 1-2 pts. wt. zinc gluconate, 0.5-1.5 pts. wt. nano-carbon powder, 0.8-1.4 pts. wt. Ammopiptanthus nanus oil, 2-3 pts. wt. maifanite powder, 0.5-1 pt. wt. ammonium persulfate, 10-15 pts. wt. nano-iron ore tailings, 3-5 pts. wt. methyl methacrylate, 4-6 pts. wt. borax, 2-3 pts. wt. glycerin and suitable amount of water. The auxiliary agent is prepared by mixing the glycerin and water in a ratio of 1:8-10, adding the zinc gluconate, nano-carbon powder, A.nanus oil, maifanite powder, methyl methacrylate and ammonium persulfate to obtained mixture, heating mixture at 80-90 degrees C, stirring the mixture for 20-30 minutes, adding nano-iron ore tailings and borax to mixture, mixing and drying obtained mixture, and crushing dried mixture to obtain product. An INDEPENDENT CLAIM is included for method for preparing the organic fertilizer, which involves (a) mixing the agar with water in a ratio of 1:150, heating and stirring obtained mixture, adding the yellow sand to the mixture, stirring the mixture for 30-40 minutes, naturally cooling the mixture to room temperature, and filtering the mixture, (b) crushing the corncob to obtain residue, mixing the residue with the oyster shell powder, dry chicken manure, nano-iron ore tailings and vermicompost, mixing EM with water in a ratio of 1:10, spraying EM mixture on the mixture containing oyster shell powder, controlling water content of the mixture at 30-40%, and fermenting the mixture 36-40 degrees C for 10-14 days, (c) mixing the potassium sulfide, calcium chloride, calcium hydrogen phosphate, urea, ammonium molybdate and auxiliary agent, adding 10-12 times water to obtained mixture, and heating and stirring mixture, and (d) mixing products obtained in steps (a) and (b), stirring mixture, simultaneously adding product obtained in step (c) to the mixture, drying the mixture, controlling water content of the mixture at less than or equal to 16%, crushing and granulating the mixture to obtain granules having particle diameter of 3-4 mm, and packaging obtained product.