Special multi-stage controlled-release compound microbial fertilizer for rice and preparation method thereof

The invention relates to a special multi-stage controlled-release compound microbial fertilizer for rice and a preparation method thereof. The special multi-stage controlled-release compound microbial fertilizer structurally comprises a rice booting fertilizer layer, a dry farmland nutrient microbial agent layer, a water-soluble sensitive layer with the pH value larger than or equal to 6, a rice seedling fertilizer layer with the pH value smaller than 6, a paddy field biocontrol microbial agent layer, a hydrolysis coating layer and a decomposed microorganism/organic matter fertilizer layer from inside to outside in sequence. Wherein the water-soluble sensitive layer with the pH value greater than or equal to 6 is made of one or more of cellulose acetate phthalate, hydroxypropyl methylcellulose acetate succinate, a methacrylic acid copolymer L100, a methacrylic acid copolymer S100 and a methacrylic acid copolymer L100; wherein the hydrolysis coating layer is made of one or more of Arabic gum, gelatin and peach