NOVELTY - Fertilizer comprises (in parts weight): amino acid mixture (20-50), multiple nutrient elements (2-20), phytosterol dispersing agent (1-10), synergistic agent (0.1-2), stabilizing agent (0.1-2) and penetrating agent (0.1-2).    USE - The fertilizer is useful for promoting plant growth.    ADVANTAGE - The fertilizer is environmentally-friendly and causes no toxic side effects.    DETAILED DESCRIPTION - Fertilizer comprises (in parts weight): amino acid mixture (20-50), multiple nutrient elements (2-20), phytosterol dispersing agent (1-10), synergistic agent (0.1-2), stabilizing agent (0.1-2) and penetrating agent (0.1-2), where the amino acid mixture is prepared by (a) using a chemical reaction kettle, hydrolyzing gluten powder and hydrochloric acid (3-9 M) to ratio of 1:1-5 at 110-113 degrees C, subjecting the hydrolyzed liquid under vacuum at 60-90 degrees C, diluting the obtained liquid with water to pH of 1-2, decoloring the diluted liquid with gluten powder (10-50%) at 70-100 degrees C for 0.5-5 hours, cooling the discolored liquid, adding sodium nitrate (50%) to the discolored liquid, filtering the obtained liquid, maintaining pH value of the filtrate to 5-7 to obtain the mixed solution of multiple amino acids. The nutrient element comprises (in parts weight): urea (10-40), monopotassium phosphate (10-40), boric acid (0.2-1), ethylenediaminetetraacetic acid disodium (0.1-1), manganese chloride (0.2-2), calcium chloride (0.2-8), magnesium sulfate (0.2-8), ferrous sulfate (0.2-2), zinc sulfate (0.2-2) and copper sulfate (0.2-2). The phytosterol aqueous dispersing agent is prepared by adding dispersing agent, wetting agent, binding agent, disintegrating agent and filling material into phytosterol (1-10%) through existing method. The phytosterol includes beta -sitosterol, stigmasterol, campesterol, brassicasterol, oat sterol, ergosterol, graminaceous sterol, lemon diesel, annular wood, pineapple alcohol, jackfruit enol and 2,4-methylene annular jackfruit. The dispersing agent (1-30%) is chosen from modified sodium lignin sulfonate A, modified sodium lignin sulfonate B, sodium lignin sulfonate, naphthalenesulfonicacid dispersing agent and styrene-acrylic acid. The wetting agent is chosen from saponin, sulfurous acid, paper pulp waste liquid and animal protein hydrolyzate. The filling material (1-5%) is chosen from argil, clay, kaoline, kieselguhr, talc, pyrophyllite and white carbon black. The binding agent (1-10%) is chosen from animal and plant oil, starch paste, gum, bean flour, animal bone glue, carboxymethyl cellulose, polyvinyl alcohol, polyethylene butyl ether and polyvinyl acetate. The disintegrating agent (1-10%) is chosen from starch, low-substituted hydroxypropyl cellulose, calcium carboxymethyl cellulose, crosslinked sodium carboxymethyl cellulose, crosslinked povidone, sodium alginate and alginic acid. The synergistic agent is chosen from tea saponin, chamaechromone, methylenedioxybenzene derivate and 6-vinyl caproaldehyde. The penetrating agent is chosen from polyoxyethylene ether, azode and triphenyl phosphate. The stabilizing agent is chosen from alkyl benzene sulfonic acid sodium salt and benzene sulfonic acid sodium salt. An INDEPENDENT CLAIM is included for method for preparing fertilizer using above-mentioned components.