The invention discloses a binary composite insecticidal compound, which is characterized in that the binary composite insecticidal compound comprises active components A and B, wherein, the active component A is pymetrozine, the active component B is one of acephate, Imidaclothiz, Dinotefuran and Diafenthiuron, and the weight ratio of the two active components is 1-90:90-1. The compound in the invention can be widely applied to crops, such as grain crop, rice, corn, cotton, vegetable, fruit trees and the like, has an active effect in preventing and curing sucking mouthparts pests which are harmful for growth of crops in hemiptera, Thysanoptera, Homoptera, dipteron and the like, such as plant hopper, thrips, cicada, leafhopper, aleyrodid, phylloxera, aphid, scale insect, Sitodiplosis mosellana Gehin, pachydiplosis oryzae wood-mason and the like. The compound of the invention has obvious synergy and is different from other insecticides.