The invention discloses a botanical pesticide capable of preventing and controlling plant insect pests. The botanical pesticide is formed by blending a microemulsion or an aqueous emulsion prepared from an auxiliary agent in a composition consisting of the following components in percentages by mass: 30-40% of veratrine, 20-40% of a cotinus coggygria extract and 20-50% of a gynura bicolor extract. The composition which is compounded by the veratrine, the cotinus coggygria extract and the gynura bicolor extract according to a certain ratio has obvious synergism, and has good prevention and control effect on mired or bemisia tabaci or peach fruit moth. The composition is blended with the microemulsion or aqueous emulsion prepared from the auxiliary agent, is stable in quality, can be stored for a long time, and is safe to the environment.