NOVELTY - A vitamin B complex-containing long-acting slow release compound fertilizer includes 10-15 pts. wt. of 1250-2000 meshes diatomite, 8-10 pts. wt. peanut straw, 12-15 pts. wt. rhizome of rehmannia, 8-10 pts. wt. phosphorus ore powder, 18-22 pts. wt. urea, 4-6 pts. wt. radix sophorae flavescentis, 12-15 pts. wt. monoammonium phosphate, 8-10 pts. wt. potassium hydroxide, 4-5 pts. wt. magnesium stearate, 10-12 pts. wt. dry river silt, 4-6 pts. wt. vitamin B complex powder, 8-10 pts. wt. vinyl acetate, and auxiliary agent including 12-14 pts. wt. poultry feather.    USE - A vitamin B complex-containing long-acting slow release compound fertilizer.    ADVANTAGE - The vitamin B complex-containing long-acting slow release compound fertilizer prevents premature of nutrient loss, has high utilization ratio, improves soil environment and yield, and improves crop quality.    DETAILED DESCRIPTION - A vitamin B complex-containing long-acting slow release compound fertilizer comprises 10-15 pts. wt. of 1250-2000 meshes diatomite, 8-10 pts. wt. peanut straw, 12-15 pts. wt. rhizome of rehmannia fertilizer, 8-10 pts. wt. phosphorus ore powder, 18-22 pts. wt. urea, 4-6 pts. wt. radix sophorae flavescentis, 2-4 pts. wt. calcium chloride, 12-15 pts. wt. monoammonium phosphate, 0.2-2 pts. wt. polymyxin, 8-10 pts. wt. potassium hydroxide, 4-5 pts. wt. magnesium stearate, 10-12 pts. wt. dry river silt, 4-6 pts. wt. vitamin B complex powder, 3-5 pts. wt. disodium octaborate tetrahydrate, 2-3 pts. wt. sodium citrate, 2-4 pts. wt. ferrous sulfate, 8-10 pts. wt. vinyl acetate, 6-8 pts. wt. acrylic acid, 0.1-0.2 pts. wt. potassium persulfate, 4-5 pts. wt. glycerin, 2-4 pts. wt. tung oil, 1-3 pts. wt. Tween 60 (RTM: polyoxyethylene (20) sorbitan monostearate), 4-5 pts. wt. auxiliary agent. The auxiliary agent comprises 12-14 pts. wt. poultry feather, 6-8 pts. wt. nanocarbon, 30-40 pts. wt. sulfuric acid solution, 1-2 pts. wt. sodium pyrophosphate, 18-20 pts. wt. activated carbon powder, sodium hydroxide solution, 1-2 pts. wt. copper citrate, 1-2 pts. wt. manganese citrate, and 1-2 pts. wt. zinc citrate. The auxiliary agent is prepared by washing poultry feather with water; sterilizing at high temperature; crushing; adding sulfuric acid solution, nanocarbon, and sodium pyrophosphate; uniformly stirring, and soaking for 25-30 hours; adding sodium hydroxide to adjust the pH value to 6.5-7.0 5, and heating to 50-70 degrees C; adding copper citrate, manganese citrate, and zinc citrate; and stirring for l-2 hours, adding activated carbon powder, uniformly stirring, and drying. An INDEPENDENT CLAIM is included for preparing the vitamin B complex-containing long-acting slow release compound fertilizer, comprising mixing peanut straw and radix sophorae flavescentis, crushing, adding water, and fermenting; mixing water with diatomite, grinding for 20-30 minutes, preparing diatomite, adding vitamin B complex powder, disodium octaborate, and ferrous sulfate, and uniformly stirring, and drying to prepare a diatomite coating material; mixing acrylic acid and deionized water, adding Tween 60 (RTM: polyoxyethylene (20) sorbitan monostearate) and glycerin, mixing for 20-30 minutes, adding vinyl acetate, tung oil, and potassium persulfate, and slowly stirring for 40-50 minutes to obtain a sustained-release coating agent; and mixing phosphorus ore powder, urea, calcium chloride, monoammonium phosphate, polymyxin, potassium hydroxide, magnesium stearate, dry river silt, sodium citrate, and auxiliary agent, granulating, spraying on sustained-release coating agent, hot air-drying, and cooling to room temperature.