The invention discloses a botanical insecticide, which comprises the following active components extracted from sophora flavescens, tobacco, common monkshood mother roots, kusnezoff monkshood roots, a wormwood, ligusticum, nux vomica, quisqualis indica and croton: 55-70% by weight of matrine, 0.5-5% by weight of tobacco-alkaloid, and 25-44 % by weight of aconitine, ligusticum oil, brucine, potassium quisqualate and crotin. The insecticide belongs to an insecticidal and acaricidal pesticide, can be used for pest control of vegetables, fruit trees, crops and the like, the selected plants are naturally ubiquitous, can be degraded by microorganisms in the nature, have no injury or residues to crops, do not pollute the environment or agricultural products, do not kill natural enemies, have no teratogenic, carcinogenic and mutagenic hazards to mammals, have strong pest-killing effects, are efficient and safe, have good control efficiency and are low in cost. The botanical insecticide is particularly suitable for controlling citrus pests.