NOVELTY - Fertilizer synergist comprises 38-42 pts. wt. zeolite, 60-80 pts. wt. modified phosphate rock powder, 4-7 pts. wt. nanocarbon, 3-4 pts. wt. attapulgite clay, 13-15 pts. wt. cottonseed cakes, 7-8 pts. wt. scarps, 10-14 pts. wt. bone meal, 5-6 pts. wt. ammonium bicarbonate and water (suitable amount). The modified phosphate rock powder comprises phosphate rock, gamma -polyglutamate powder, ferrous sulfate, calcium bicarbonate, Bacillus, silicate inoculant, EDTA chelating copper, humic acid, black liquor and corn starch.    USE - The fertilizer synergist is useful for oilseed rape (claimed).    ADVANTAGE - The fertilizer synergist improves soil fertility, quality and yield of the oilseed rape.    DETAILED DESCRIPTION - Fertilizer synergist comprises 38-42 pts. wt. zeolite, 60-80 pts. wt. modified phosphate rock powder, 4-7 pts. wt. nanocarbon, 3-4 pts. wt. attapulgite clay, 13-15 pts. wt. cottonseed cakes, 7-8 pts. wt. scarps, 10-14 pts. wt. bone meal, 5-6 pts. wt. ammonium bicarbonate and water (suitable amount). The modified phosphate rock powder comprises 90-110 pts. wt. phosphate rock, 1-2 pts. wt. gamma -polyglutamate powder, 4-8 pts. wt. ferrous sulfate, 6-9 pts. wt. calcium bicarbonate, 2-3 pts. wt. Bacillus, 3-4 pts. wt. silicate inoculant, 18-22 pts. wt. EDTA chelating copper, 24-26 pts. wt. humic acid, 13-17 pts. wt. black liquor and 35-45 pts. wt. corn starch. The modified phosphate rock powder is prepared by uniformly mixing the raw materials, crushing the mixture into 150 meshes sieve, heating the mixture at 40-60 degrees C for 20 minutes, stirring the mixture for 30 minutes, inoculating Bacillus, cooling the mixture, fermenting the mixture at 20-30 degrees C for 7-8 days, drying the mixture and crushing the mixture. An INDEPENDENT CLAIM is included for method for preparing the above-mentioned fertilizer synergist, which involves (a) sintering zeolite at 700-800 degrees C for 2-4 hours, cooling the zeolite, and crushing the zeolite into fine powder, (b) mixing cotton seed cake, tobacco and bone powder, adding water to the mixture, fermenting the mixture at 45-55 degrees C for 3-4 weeks, drying and crushing the mixture into fine powder, (c) mixing zeolite powder and fermented powder, adding attapulgite clay, uniformly stirring the mixture, and fermenting the mixture, and (d) adding the other raw materials, crushing the raw materials into powder, and packaging the product.