NOVELTY - Fertilizer is prepared using e.g. wheat straw, rice straw, corncob, clay, humic acid, polymethyl methacrylate, effective microorganisms (EM), soil conditioner and suitable amount of water. The preparation method involves mixing the above-mentioned raw materials with ammonium sulfate and suitable amount water to obtain slurry, heating the obtained slurry, adding ammonium persulfate to the obtained mixture, stirring and reacting obtained mixture, heating and concentrating the mixture to obtain paste, granulating obtained paste and drying to obtain product.    USE - The fertilizer is useful for fruit trees (claimed).    ADVANTAGE - The fertilizer improves fruit yield and quality, soil fertility and water permeability and resists drought and disease of fruit trees.    DETAILED DESCRIPTION - Fertilizer is prepared using 300-400 pts. wt. wheat straw, 200-240 pts. wt. rice straw, 140-180 pts. wt. corncob, 50-60 pts. wt. clay, 24-28 pts. wt. humic acid, 45-50 pts. wt. monoammonium phosphate, 12-16 pts. wt. urea, 10-12 pts. wt. potassium sulfate, 4-5 pts. wt. ammonium sulfate, 4-5 pts. wt. boric acid, 1-2 pts. wt. polymethyl methacrylate, 6-9 pts. wt. effective microorganisms (EM), 10-15 pts. wt. soil conditioner and suitable amount of water, where the soil conditioner comprises 120-130 pts. wt. weathered coal, 24-30 pts. wt. bamboo charcoal, 3-4 pts. wt. nano jade powder, 1-2 pts. wt. borax, 2-3 pts. wt. nano calcium carbonate, 10-12 pts. wt. peat, 2-3 pts. wt. boric acid, 9-12 pts. wt. Pinus contorta powder, 2-3 pts. wt. neopentyl glycol, 2-3 pts. wt. sodium selenite, 2-3 pts. wt. carboxymethyl cellulose, 2-3 pts. wt.zinc sulfate, 2-3 pts. wt. magnesium sulfate, 3-4 pts. wt. eucalyptus oil, 3-5 pts. wt. ammonium persulfate and suitable amount of water. The preparation method involves mixing the above-mentioned raw materials with ammonium sulfate and suitable amount water to obtain slurry, heating the obtained slurry at 80-90 degrees C, adding ammonium persulfate to the obtained mixture, stirring and reacting for 40-60 minutes, heating and concentrating the mixture to obtain paste, granulating obtained paste and drying to obtain product.