The invention discloses a high-slow release organic fertilizer for improving the micro-ecological structure of soil. The high-slow release organic fertilizer comprises raw materials, including urea, monoammonium phosphate, potassium fulvic acid, ammonium chloride, diammonium hydrogen phosphate, ferrous sulfate, zinc sulfate, ammonium molybdate, ammonium nitro complex, ammonium sulfate, vermiculite, lime powder, kaolin, sesame dregs, stannous chloride, sodium hydrogen sulfite, borax, silkworm excrement, cow dung, bean cakes, cottonseed meal, corn straw, rapeseed cakes, bagasse, oil cakes, EDTA (Ethylene Diamine Tetraacetic Acid) chelate, humic acid, EM (Effective Microorganisms) bacteria, amino acid chelate and a modified slow-release agent. The invention further discloses a preparation method of the high-slow release organic fertilizer for improving the micro-ecological structure of soil. The prepared high-slow release organic fertilizer has an excellent slow-release property, can provide rich nutrient substances for crops, can promote crop growth, and can increase the yield and improve the quality of the crops.