NOVELTY - An onion planting special slow-release fertilizer comprises medical stone powder, chicken manure, brown sugar residue, bagasse, hay, castor cake, earthworm soil, biological fermentation strain agent, high nitrogen ammonium humate, diammonium phosphate, amino acid, dipotassium hydrogenphosphate, boron, zinc sulfate, sodium dodecyl sulfate, urea-formaldehyde resin, auxiliary agent, and water.    USE - Onion planting special slow-release fertilizer.    ADVANTAGE - The slow-release fertilizer is rich in organic matter, and nitrogen, phosphorus, potassium and other trace elements, contains variety of nutrients needed for growth of onions, releases nutrient elements during gum resin soil degradation process, and it has increased solubility, reduced fertilizer dosage, improved soil properties.    DETAILED DESCRIPTION - An onion planting special slow-release fertilizer comprises 5-7 pts. wt. medical stone powder, 10-12 pts. wt. chicken manure, 7-8 pts. wt. brown sugar residue, 6-8 pts. wt. bagasse, 3-5 pts. wt. hay, 12-15 pts. wt. castor cake, 8-10 pts. wt. earthworm soil, 2-3 pts. wt. biological fermentation strain agent, 6-8 pts. wt. high nitrogen ammonium humate, 5-7 pts. wt. diammonium phosphate, 2-3 pts. wt. amino acid, 4-5 pts. wt. dipotassium hydrogenphosphate, 10-13 pts. wt. boron, 5-7 pts. wt. zinc sulfate, 1-3 pts. wt. sodium dodecyl sulfate, 4-6 pts. wt. urea-formaldehyde resin, 4-5 pts. wt. auxiliary agent, and balance water. The auxiliary agent comprises 6-7 pts. wt. agar, 3-4 pts. wt. ethylene glycol dimethacrylate, 1-2 pts. wt. bamboo coal powder, 7-9 pts. wt. borax, 5-6 pts. wt. zinc borate, 3-5 pts. wt. glycerol, 1-2 pts. wt. zinc sulfate, 2-3 pts. wt. ammonium molybdate, 10-14 pts. wt. starch, and balance water. The auxiliary agent is prepared by mixing agar and starch, adding 50 pts. wt. water, heating while stirring to dissolve, adding remaining components, continuously heating while stirring for 70-80 minutes, and cooling to room temperature. An INDEPENDENT CLAIM is included for preparation of slow-release fertilizer comprising crushing chicken manure, brown sugar residue, bagasse, hay, castor cake and earthworm soil into ultrafine dry powder, adding biological fermentation strain agent, diluting with 10 times water, adjusting water content to 30-35%, and fermenting to 35-48 degrees C for 18-20 days while turning once every 2 days; mixing high nitrogen ammonium humate, diammonium phosphate, amino acid, dipotassium hydrogenphosphate, boron and zinc sulfate, adding 4-5 times water, heating while stirring to dissolve, adding sodium dodecyl sulfate and urea-formaldehyde resin, and stirring for 20-30 minutes to obtain mixture; adding medical stone powder, and heating while stirring constantly for 40-50 minutes to obtain gummy mixture; and mixing with fermented material, adding auxiliary agent, mechanically stirring for 20-25 minutes, and granulating.