NOVELTY - Soybean fertilizer comprises (pts.wt.) organic substance (100-300), composite fertilizer (100-300), active sealing agent (0.2-3), acrylamide (100-200), starch (50-150), attapulgite (20-50), porous inorganic substance (20-50), clay (30-70), acidic liquid (100-150), initiator (2-4), crosslinking agent (0.5-1), and compost fermenting agent (0.03-0.1). The composite fertilizer comprises nitrogen, phosphorus, potassium, zinc, and molybdenum at ratio of 1:1.1-1.5:0.8-1.1:0.25-0.4:0.07-0.1.    USE - Soybean fertilizer.    ADVANTAGE - The fertilizer has moisture retention effect by utilizing water-retaining agent and soil improvement property by utilizing organic substance, porous inorganic substance and clay to improve soil structure, increase organic substance of soil and improve pH of soil.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the fertilizer, comprising:    (A) crushing organic material and humic acid, sieving through a screen of 100 meshes, adding compost fermenting agent and agitating; composting and fermenting for two weeks at normal temperature, keeping temperature at 45-60 degrees C and humidity at 60-70%, fermenting for 24-72 hours; drying for three days to obtain matured organic fertilizer; and secondarily crushing to obtain compost product, where the humic acid is grass peat and/or lignite and the organic material is sawdust, peanut cake, or soybean cake;    (B) adding water to starch for gelatinizing for 20 minutes to 1 hour at 50-100 degrees C, adding acidified and crushed attapulgite, acrylamide, compost product, crosslinking agent and initiator, heating to 40-90 degrees C and reacting for 4-5 hours;    (C) adding alkaline liquid into the obtained starchy material to adjust pH to 7.5-9.5, heating to 90-100 degrees C to hydrolyze for 1-3 hours, washing, drying and crushing the reacted product;    (D) adding porous inorganic substance and clay into acidic liquid, agitating for 10-50 minutes, soaking for 3-40 hours, filtering, and adding alkaline liquid to adjust pH to 3-6.5; and    (E) mixing the material obtained in the third and fourth steps with composite fertilizer, composting for 3-5 days at room temperature, air drying or drying with a drier, crushing and then spraying 0.8-1.5 mol/L diluted sulfuric acid (0.9-1.1 wt.%) as binder to the material, granulating in a circular granulator, then conveying into a double-arm mixing machine, starting the machine, rotating and spraying vaporous emulsifier, uniformly agitating, and then drying and packing.