Compound insecticide comprising imidacloprid and pymetrozine

The invention relates to a pesticide compound, and particularly relates to a compound insecticide comprising imidacloprid and pymetrozine. The compound insecticide is characterized in that the weight ratio of imidacloprid to pymetrozine is 1:0.67 to 1:24. Through laboratory bioassays, two compounding proportions with obvious synergistic effects are obtained by screening, when content ratio of imidacloprid to pymetrozine is 3:2 and 1:3, the cotoxicity coefficients thereof are respectively 410.38 and 616.17, and a high level synergistic effect is shown. The compound insecticide is reasonable in ratio, has strong virulence on brown planthopper and other hemiptera insects, is high in cotoxicity coefficient, has a strong synergistic effect, and is a high-efficiency low-toxicity compound agent.