NOVELTY - Amino acid fertilizer comprises 40-60 wt.% of amino acid solution, 0.5-1 wt.% of trace elements, 13-20 wt.% of fermented organic matters, 15-20 wt.% of inorganic fertilizers, 5-10 wt.% of minerals, 5-10 wt.% of water conditioner, 0.5-1 wt.% of beneficial bacteria and 1-2 wt.% of thickener, where the amino acid solution is obtained by hydrolyzing human hair, pig hair, chicken feather, duck feather, goose feather, wool and cow hair with hydrochloric acid.    USE - The amino acid fertilizer is useful in aquaculture (claimed).    ADVANTAGE - The amino acid fertilizer improves immunity and quality of fish with reduced disease occurrence and fish-farming cost.    DETAILED DESCRIPTION - Amino acid fertilizer comprises 40-60 wt.% of amino acid solution, 0.5-1 wt.% of trace elements, 13-20 wt.% of fermented organic matters, 15-20 wt.% of inorganic fertilizers, 5-10 wt.% of minerals, 5-10 wt.% of water conditioner, 0.5-1 wt.% of beneficial bacteria and 1-2 wt.% of thickener, where: the amino acid solution is obtained by hydrolyzing of human hair, pig hair, chicken feather, duck feather, goose feather, wool and cow hair with hydrochloric acid; the amino acid solution comprises 1.3-2.5 mass% of aspartate, 1-1.6 mass% of threonine, 1.8-4 mass% of serine, 2-3.5 mass% of glutamic acid, 2-3 mass% of proline, 2-3.5 mass% of glycine, 1.6-2 mass% of alanine, 0.6-0.8 mass% of cystine, 1.5-2 mass% of valine, 0.1-0.2 mass% of methionine, 0.5-1.5 mass% of iso-leucine, 0.6-0.8 mass% of leucine, 0.2-0.3 mass% of tyrosine, 1.2-1.5 mass% of phenylalanine, 0.3-0.4 mass% of lysine, 0.1-0.2 mass% of histidine, 0.1-0.2 mass% of tryptophan and 1.5-2 mass% of arginine; the trace elements comprise ferrous sulfate, magnesium sulfate, manganese sulfate, ammonium molybdate, zinc sulfate, cobalt sulfate, sodium borate, sodium silicate and sodium selenate; the fermented organic matters comprise fermented cake meal, distiller grains, straw powder and unite bran; the inorganic fertilizers comprise urea, ammonium chloride, ammonium sulfate, ammonium bicarbonate, ammonium nitrate, ammonium humate, monoammonium phosphate, diammonium phosphate, calcium magnesium phosphate fertilizer, calcium superphosphate and heavy calcium persulfate; the minerals comprise kaolin, diatomaceous earth, bentonite, activated clay and zeolite powder; the water conditioner comprises potassium fulvate, sodium humate, calcium peroxide and sodium perborate; the beneficial bacteria comprises lactic acid bacteria, bifidobacterium, bacillus, yeast, nitro-bacteria and photosynthetic bacteria; and the thickener comprises glyceryl stearate, polyacrylamide, gelatin, carrageenan and xanthan gum. An INDEPENDENT CLAIM is included for preparing the amino acid fertilizer, comprising performing hydrolysis reaction on hydrolyzed hair and hydrochloric acid at 108-115 degrees C for 6-8 hours, where the ratio of the hair to the hydrochloric acid is 1:2 to obtain solution, neutralizing the obtained solution using 99.9% of liquid ammonia at 40-70 degrees C until a pH value reaches 4.8-5.1, filtering the neutralized solution to obtain filtrate using L-cystine, L-leucine and L-tyrosine, concentrating the obtained filtrate at 28-30 degrees C under -0.06 to -0.08 MPa to obtain amino acid solution, uniformly stirring the organic matters and the amino acid solution in a ratio of 1:1, inoculating the organic raw material with 0.5-1% of the beneficial bacteria into the stirred mixture, uniformly stirring the inoculated mixture and piling, performing fermentation process on the piled mixture at 50-60 degrees C for 6-8 days to obtain fermented organic matters, heating the amino acid solution at 70-90 degrees C, adding trace elements into the heated solution, stirring the mixture, performing chelation process on the stirred mixture for 2-3 hours, sequentially mixing the fermented organic matters, inorganic fertilizers, minerals and beneficial bacteria into the mixture, uniformly stirring the mixture, adding the thickener into the stirred mixture, and uniformly stirring the mixture.