Microorganism organic fertilizer and preparation method thereof

The invention discloses a microorganism organic fertilizer, which consists of straw, flour, lime, potassium dihydrogen phosphate, water and liquid mixed strain (NEM), wherein the weight percentages of the straw, the flour, the lime, the potassium dihydrogen phosphate and the water are as follows: 65 to 75% by weight of straw, 12 to 15% by weight of flour, 1% by weight of lime, 0.5% by weight of potassium dihydrogen phosphate and 13.5 to 21.5% by weight of water, and the addition amount of the liquid mixed strain (NEM) accounts for 5 to 10% by weight of the total weight of the straw, the flour, the lime, the potassium dihydrogen phosphate and the water. According to the invention, plenty of phosphatase, protease, polypeptide amino and other substances are generated in mixed fermentation, the utilization rate of fertilizers is enhanced, the growth of plant root is simultaneously promoted so that the plant root absorbs more nutrients, the growing plant feeds a large number of nutrients back to soil through the r