NOVELTY - Improved soil fertilizer composition comprises urea, monoammonium phosphate, potassium chloride, sweet potato powder, tender grass, mud of pond grooves, animal hair, wheat bran, brown sugar, preservatives containing fermentation microorganism, attapulgite, boric acid, maifanite, phosphate rock powder, bentonite, oil shale ash, microbial agent, humus, calcium phosphate, ferrous sulfate, zinc sulfate, copper sulfate, and sodium molybdate.    USE - The improved soil fertilizer composition is useful for spinach (claimed).    ADVANTAGE - The fertilizer composition improves absorption of nutritional components by spinach, and enables soil improvement. The utilization rate of the fertilizer is improved.    DETAILED DESCRIPTION - Improved soil fertilizer composition comprises 25-35 pts. wt. urea, 20-30 pts. wt. monoammonium phosphate, 20-30 pts. wt. potassium chloride, 25-35 pts. wt. sweet potato powder, 25-30 pts. wt. tender grass, 30-40 pts. wt. mud of pond grooves, 25-30 pts. wt. animal hair, 15-20 pts. wt. wheat bran, 1-3 pts. wt. brown sugar, 1-2 pts. wt. preservatives containing fermentation microorganism, 5-10 pts. wt. attapulgite, 1-4 pts. wt. boric acid, 6-10 pts. wt. maifanite, 7-10 pts. wt. phosphate rock powder, 15-18 pts. wt. bentonite, 8-14 pts. wt. oil shale ash, 1-1.5 pts. wt. microbial agent, 9-11 pts. wt. humus, 12-15 pts. wt. calcium phosphate, 5-7 pts. wt. ferrous sulfate, 1-3 pts. wt. zinc sulfate, 2-6 pts. wt. copper sulfate, and 5-7 pts. wt. sodium molybdate. The fertilizer composition is prepared by (a) adding the sweet potato powder, tender grass, mud of pond grooves, animal hair, wheat bran, brown sugar and preservatives containing fermentation microorganism to fermentation tank, uniformly stirring obtained mixture, controlling water content of the mixture at 45-50 wt.%, maintaining the mixture at static condition, fermenting the mixture for 15-22 days, stirring the mixture once for every 1-3 days during fermentation, increasing temperature of fermented product to 55-62 degrees C for 2-4 hours, maintaining temperature of the fermented product at 70-80 degrees C for 1-3 hours, then maintaining the temperature of the fermented product at 65-68 degrees C for 2-4 hours, and increasing temperature of the fermented product to 88-93 degrees C for 1-2 hours, (b) sequentially adding the attapulgite, boric acid, maifanite, phosphate rock powder, bentonite and oil shale ash to the mixture obtained in step (a), stirring obtained mixture, adding microbial agent, humus, calcium phosphate, ferrous sulfate, zinc sulfate, copper sulfate and sodium molybdate to the mixture, fermenting obtained mixture, turning the mixture once when temperature of the mixture reaches 55-58 degrees C, and again turning the mixture once when temperature of the mixture reaches 65-70 degrees C, and (c) adding the urea, monoammonium phosphate and potassium chloride to the mixture, and uniformly mixing and granulating the mixture to obtain product.