The invention provides a novel biological broad-spectrum 
pesticide and a preparation method thereof. The novel biological broad-spectrum 
pesticide is prepared by mixing and fermenting ginger, hot pepper, pepper, tobacco leaves and soybean milk fermenting liquid according to a certain weight ratio. The novel biological broad-spectrum 
pesticide adopts natural plants and probiotics as a core, is prepared through pure biological 
fermentation, is not added with any chemically synthetic ingredients, has the characteristics of 
broad spectrum, safety, environmental friendliness and the like, can be applied to preventing and controlling 
insect damage of organic food, 
green food and agricultural exports, is a new-generation green pesticide, can be widely applied to controlling agricultural and forest pests of vegetables, fruit trees, gardening flowers, tea gardens and fields, has obvious effect of killing various pests, such as Heliothis armigera, 
aphid, lice, grubs, red spiders, size insects, Meloidogyne and the like, of crops in 
agriculture and 
forestry, is particularly applicable to production of green 
pollution-free agricultural products and agricultural exports, and can meet requirements on detection of any residues.