Special biological organic fertilizer for rice and preparation method thereof

The invention discloses a special biological organic fertilizer for rice. The special biological organic fertilizer for the rice comprises the following components as raw materials in parts by weight:3-20 parts of bacillus subtilis, 20-45 parts of humic acid organic matter, 1-5 parts of polysaccharide, 2-8 parts of amino acid, 0.1-2.0 parts of a carbohydrate activating agent, 10-30 parts of diatomite and 4-8 parts of silicate. The preparation method comprises the following steps: culturing and fermenting liquid bacteria; mixing different batches of bacillus fermented liquid; adding the polysaccharide, the amino acid, the carbohydrate activating agent into the fermented liquid, mixing, sealing and standing for 2 days to obtain fertilizer base liquid; uniformly mixing the organic matter, the diatomite and the silicate proportionally to obtain a fertilizer matrix; slowly adding the base liquid into the matrix, and uniformly stirring to obtain needed fertilizer powder; mechanically granulating through extrusion granulation or roller granulation to obtain fertilizer granules.