NOVELTY - Multi-spraying production of organic chelate multi-element fertilizer involves preparing composite amino acid solution by acidolyzing solid keratin substance, 15% hydrochloric acid, and 20% sulfuric acid; preparing active humus by fermenting peat and crop straw using composite bacteria liquid and 15% concentrated aqueous ammonia; putting antioxidant and inorganic salt trace element to reaction kettle; adding composite amino acid solution and active humus; adjusting pH at 5-6; steam heating; and adjusting pH at 7 to obtain chelated product solution.    USE - Multi-spraying production of organic chelate multi-element fertilizer.    ADVANTAGE - The method produces organic chelate multi-element composite fertilizer with high stability and high plant absorption rate.    DETAILED DESCRIPTION - Multi-spraying production of organic chelate multi-element fertilizer comprises subjecting solid keratin substance, 15% hydrochloric acid, and 20% sulfuric acid at weight ratio of 1:(1-3):(1-5) to acidolysis reaction at 90-120 degrees C for 15-25 hours while stirring; adding ammonia solution to adjust pH of acid solution to 7-8; filtering to obtain composite amino acid solution; uniformly mixing peat and crop straw at weight ratio of (2-3):1; crushing to 20-60 meshes; adding composite bacteria liquid and 15% concentrated aqueous ammonia; stirring for 2 hours; sealing; fermenting at 60-80 degrees C for 5 days; adding 15% potassium hydroxide solution to fermented material to adjust pH at 7-8 and to obtain active humus, in which weight ratio of peat and crop straw, composite bacterial liquid, and 15% aqueous ammonia is 1:(0-0.3):(0.05-0.1); putting antioxidant and inorganic salt trace element to reaction kettle; adding composite amino acid solution and active humus; adjusting pH at 5-6 using acidic solution; steam heating reaction kettle at 50-80 degrees C and at 0.5-0.8 MPa for 0.5-2.0 hours while stirring; adjusting pH at 7 using alkaline solution to obtain chelated product solution; putting chelated product solution into storage tank, in which weight ratio of inorganic salt trace element, composite amino acid solution and active humus is 1:(0.5-3.0):(0.1-3.0), and mol ratio of antioxidant and metal ion in inorganic salt is 1:(1-2); reacting potassium chloride and 98% concentrated sulfuric acid at weight ratio of 1:1.5 to obtain mixture of potassium sulfate and hydrogen chloride gas; absorbing hydrogen chloride gas by absorbent to generate mixture of hydrochloric acid and potassium sulfate; adding monoammonium phosphate solution with mixture in tube reactor; introducing ammonia gas to adjust neutralization degree of mixed slurry to 1-1.2; adding urea to slurry and neutralizing to obtain granulating slurry, in which mass ratio of potassium sulfate, monoammonium phosphate solution, and urea is (0.85-1.9):(0.7-2):1; putting chelated product solution and granulating slurry at weight ratio of 1:(10-20) into groove of granulator; uniformly mixing; spray granulating; and drying to obtain organic chelate-type multi-element fertilizer.