Multifunctional microbial fertilizer and preparation method thereof

The invention relates to a multifunctional microbial fertilizer and a preparation method thereof. The preparation method comprises the following steps: mixing pig manure, seaweeds and mushroom residues according to a mass ratio of 40:20:40, inoculating with an Arthrobacter nicotianae fermentation liquor at an inoculum size of 10%, and fermenting the above raw material mixture in a solar aerated aerobic fermentation tank for 15-20 d to form a primary fermentation material; and uniformly mixing a Bacillus mucilaginosus fermentation liquor having an inoculum size of 5% and a Bacillus amyloliquefaciens fermentation liquor having an inoculum size of 5% with the primary fermentation material, and performing fermentation for 5-7 d to finally obtain the required multifunctional microbial fertilizer. The multifunctional microbial fertilizer can promote the development of crop roots, promote the growth of crops and improve the disease resistance of crops, has a good inhibition effect on tobaccobacterial wilt, and has c