NOVELTY - Preparation of organic chelate fertilizer includes preparing humic liquid from crushed cattail and crop straw, composite bacteria liquid, and sodium bicarbonate solution, adding composite amino acid and inorganic trace element into a reaction kettle, adding the humic liquid for chelation, adjusting the pH by acid solution, charging saturated steam in the reaction kettle, stirring and reacting, adjusting the pH with alkaline material, adding nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, and water, uniformly mixing, spray granulating, and drying.    USE - Preparation of organic chelate fertilizer (claimed).    ADVANTAGE - The organic chelate fertilizer has high stability and high plant absorption rate.    DETAILED DESCRIPTION - Preparation of organic chelate fertilizer comprises taking cattail and crop straw, cleaning, crushing to 20-60 mesh, uniformly mixing at 2-3:1 weight ratio, adding composite bacteria liquid and 15% sodium bicarbonate solution, stirring for 2 hours, sealing at 60-80 degrees C to ferment for 5 days, adding 15% potassium hydroxide solution, adjusting the pH at 7-8, obtaining humic liquid, where the weight ratio of the mixture of composite bacteria liquid and 15% sodium bicarbonate solution, cattail, and crop straw is 1:0.2-0.3:0.05-0.1, adding composite amino acid and inorganic trace element into a reaction kettle, adding the humic liquid for chelation, adjusting the pH at 5-6 by acid solution, charging saturated steam at 0.5-0.6 MPa in the reaction kettle, stirring and reacting at 50-80 degrees C for 0.5-2 hours, adjusting the pH at 7 with alkaline material, obtaining chelated product solution, storing the chelated product solution in a storage tank, where the weight ratio of trace element to the total content of solvent and humic liquid is 1:2-3, and the weight ratio of composite amino acid and humic liquid is 0.5-3:2-3, adding nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, and water at 0.8-0.85:1.1-1.3:0.95-1.2:1 weight ratio, uniformly mixing, spray granulating, and drying.