NOVELTY - Fertilizer synergistic agent comprises 42-45 pts. wt. bentonite, 4-5 pts. wt. ammonium molybdate, 3-4 pts. wt. attapulgite clay, 60-80 pts. wt. modified powdered rock phosphate, 1-3 pts. wt. prepared gibberellins, 17-19 pts. wt. peanut cake powder, 6-8 pts. wt. lime, 10-15 pts. wt. cotton straw powder and balanced amount of water. Modified powdered rock phosphate comprises 90-110 pts. wt. powdered rock phosphate, 1-2 pts. wt. gamma-polyglutamic acid powder, 4-8 pts. wt. ferrous sulfate, 6-9 pts. wt. calcium bicarbonate, 2-3 pts. wt. Bacillus subtilis and 3-4 pts. wt. fungi.    USE - Fertilizer synergistic agent used for promoting growth and development of peanut (claimed).    ADVANTAGE - The fertilizer synergistic agent neutralizes soil acidity, improves soil structure, increases soil organic matter content, and eliminates harmful ion to increase effectiveness of nutrient.    DETAILED DESCRIPTION - Fertilizer synergistic agent comprises 42-45 pts. wt. bentonite, 4-5 pts. wt. ammonium molybdate, 3-4 pts. wt. attapulgite clay, 60-80 pts. wt. modified powdered rock phosphate, 1-3 pts. wt. prepared gibberellins, 17-19 pts. wt. peanut cake powder, 6-8 pts. wt. lime, 10-15 pts. wt. cotton straw powder and balanced amount of water. Modified powdered rock phosphate comprises 90-110 pts. wt. powdered rock phosphate, 1-2 pts. wt. gamma-polyglutamic acid powder, 4-8 pts. wt. ferrous sulfate, 6-9 pts. wt. calcium bicarbonate, 2-3 pts. wt. Bacillus subtilis, 3-4 pts. wt. fungi, 18-22 pts. wt. EDTA chelated copper, 24-26 pts. wt. manganese, 13-17 pts. wt. humic acid and 35-45 pts. wt. corn starch. Modified powdered rock phosphate is prepared by heating humic acid and adding powdered rock phosphate at 400-500 degrees C. Remaining components are crushed and Bacillus subtilis, microbial inoculum and fungi microbial inoculums are added to carry out fermentation to at 20-30 degrees C for7-8 days to obtain fermentation product. The fermentation product is dried and ground through 100-120 meshes sieve into fine powder. An INDEPENDENT CLAIM is included for a method for preparing fertilizer synergistic agent, which involves:    (A) sintering bentonite at 650-750 degrees C for 3-4 hours, cooling and grinding through 100 meshes sieve into fine powder;    (B) mixing peanut cake powder, lime and cotton straw powder, and fermenting in a fermentation pool after adding water at 45-50 degrees C for 3-4 weeks, drying it and grinding into fine powder; and    (C) mixing remaining components wit obtained products, and then grinding through 80-120 meshes sieve.