Preparation method of biological multi-effect fertilizer

The invention relates to a preparation method of a biological multi-effect fertilizer. The preparation method comprises the following steps: 1, adding livestock and poultry manure, crop straws and vegetable residues into a composting agent, and fully mixing; 2, after mixing is completed, stacking the mixture obtained in the step 1 in the field; 3, performing fermentation operation on the cut strips obtained in the step 2, regularly detecting the temperature of the cut strips during fermentation, performing pile turning operation when the temperature of the cut strips is higher than 65 DEG C, and fermenting for 20 days; and 4, after fermentation is completed, adding microorganisms, evenly mixing, and then directly applying the fertilizer to the field. According to the invention, the production and sales mode of traditional commercial organic fertilizers is broken through, high-temperature aerobic fermentation and high-quality efficient cultivation technologies are adopted, rural organic wastes are fully utiliz