Botanical fungicide containing coptis chinensis and rheum officinale, and preparation method of botanical fungicide

The invention discloses a botanical fungicide containing coptis chinensis and rheum officinale, and a preparation method of the botanical fungicide. According to the invention, traditional Chinese medicines coptis chinensis and rheum officinale are used as raw materials, a coptis chinensis and rheum officinale fermentation product is prepared through a microbial fermentation technology, and an emulsifier and a microbial fermentation aid, a dispersant, a stabilizer and other assistants are added to prepare the botanical fungicide containing coptis chinensis and rheum officinale, wherein the coptis chinensis and rheum officinale fermentation product comprises the following components in parts by weight: 30-50 parts of coptis chinensis, 25-40 parts of rheum officinale, 5-10 parts of an emulsifier, 1-8 parts of a microbial fermentation aid, 1-6 parts of a dispersing agent, 1-4 parts of a stabilizer, 1-4 parts of an antifreeze agent and 25-50 parts of a weakly acidic solution; the bactericide prepared by the metho