NOVELTY - An amino acid-containing tobacco foliar fertilizer is prepared by degreasing waste animal fur and skin, oven-drying, grinding, adding, e.g. molasses, peptone and dipotassium phosphate, adjusting pH to 8.5, performing Freund split mold fermentation, filtering, decomposing residue into amino acids using keratinase, filtering, continuously decomposing residue into amino acids, filtering, where filtrate is amino acid crude solution, mixing amino acid crude solution and chelating agent, stirring, adding, e.g. potassium sulfate, ammonium sulfate and surfactant, stirring and adjusting pH.    USE - The method is used for preparing fertilizer for promoting growth of tobacco roots, improving growth of length, width and thickness of tobacco leaves and strengthening immunity against diseases.    ADVANTAGE - The method improves the quality and quantity of tobacco.    DETAILED DESCRIPTION - An amino acid-containing tobacco foliar fertilizer is prepared from 30-50 pts. wt. amino acid crude solution, 15-18 pts. wt. potassium sulfate, 15-25 pts. wt. ammonium sulfate, 15-18 pts. wt. potassium dihydrogen phosphate, 3-6 pts. wt. potassium humate, 1.3-2 pts. wt. trace element, 0.3-0.5 pt. wt. surfactant, 0.5-1 pt. wt. chelating agent and 0.15-0.2 pt. wt. plant growth regulator. It is prepared by degreasing waste animal fur and skin, oven-drying, grinding to 60 meshes, taking 2% waste animal fur and skin powder, adding 1% molasses, 0.5% peptone, 0.1% dipotassium phosphate, 0.025% magnesium sulfate, 0.0001% manganese sulfate and 0.0001% zinc sulfate, adjusting pH to 8.5 using sterilized water, performing Freund split mold fermentation, filtering, adding 3-5% waste animal fur and skin powder, decomposing residue into amino acids using keratinase, filtering, continuously decomposing residue into amino acids, filtering, where filtrate is amino acid crude solution, weighing raw materials, mixing amino acid crude solution and chelating agent, stirring to dissolve to prepare chelating solution, adding potassium sulfate, ammonium sulfate, potassium dihydrogen phosphate, potassium humate, trace element, surfactant and plant growth regulator, stirring to dissolve and adjusting pH to 5.5-7.8 using dilute sulfuric acid. The trace element is magnesium sulfate, zinc sulfate, sodium borate, manganese sulfate, copper sulfate, ferrous sulfate and/or ammonium molybdate. The surfactant is Tween 80 (RTM: polyoxyethylene (20) sorbitan monooleate), Tween 60 (RTM: polyoxyethylene (20) sorbitan monostearate), triethanolamine, sodium dodecylbenzenesulfonate and/or sodium lauryl sulfate. The chelating agent is EDTA, diethylenetriaminepentaacetic acid and/or diaminocyclohexanetetraacetic acid. The plant growth regulator is sodium acetate, sodium nitrophenolate, DA-6, brassinolide and/or triacontane.