Fecha de publicación: 16/04/2021 Fuente: Wipo Tobacco Agriculture The invention relates to a botanical insecticide and a preparation method and application thereof. The botanical insecticide is prepared from the following raw materials in parts by weight: 25-35 parts of pepper processing leftovers, 25-35 parts of tobacco processing leftovers, 20-30 parts of tea processing leftovers, 15-25 parts of radix sophorae flavescentis, 15-25 parts of tripterygium wilfordii, 10-20 parts of garlic juice, 10-20 parts of onion juice and 3-8 parts of acetic acid. The botanical insecticide prepared by adopting the method disclosed by the invention has the advantages of simple components, safety and convenience in use, no pollution to crops, no residue, good insecticidal effect, difficulty in generating drug resistance of pests, broad insecticidal spectrum, no toxicity to human and livestock, wide source, simple preparation method, large-scale production, and popularization and application.