Microbial preparation for preventing and treating tobacco mosaic virus and preparation method thereof

The invention provides a microbial preparation for preventing and treating tobacco mosaic virus. The microbial preparation comprises a microbial mixed inoculant, a plant immune resistance inducer anda leaf extracting solution, wherein the leaf extracting solution is a left extracted solution of a tobacco plant which generates immune response after being sprayed with a plant immune resistance inducer; the mass percentages of the microbial mixed inoculant, the plant immune resistance inducer and the leaf extracting solution are as follows: 5%-10% of the microbial mixed inoculant, 3%-5% of the plant immune resistance inducer, 10%-15% of the leaf extracting solution and the balance of sterile water, and the plant immune resistance inducer is a tobacco mosaic virus capsid protein solution; theplant immune resistance inducer disclosed by the invention plays a role of an immune excitation factor, can induce a plant immune system to generate stress immune response and induce the plant immunesystem to generate immune