The invention belongs to the technical field of pesticide preparations, and particularly relates to an insecticide composition and a preparation method thereof. The insecticide composition is preparedfrom the following raw materials in fraction by mass: 10 to 25% of Paichongding(1-((6-chloropyridin-3-yl)methyl)-7-methyl-8-nitro-5-propoxy-1,2,3,5,6,7-hexahydroimidazo[1,2-a]pyridine), 5 to 10% of quinalphos, 5 to 10% of sodium methyl cocoyl taurate, 30 to 50% of water, and 25 to 30% of organic solvent. The insecticide composition has the advantages that the insecticide composition is a Paichongding(1-((6-chloropyridin-3-yl)methyl)-7-methyl-8-nitro-5-propoxy-1,2,3,5,6,7-hexahydroimidazo[1,2-a]pyridine) and quinalphos compounding type insecticide, so that the obvious synergistic function is realized, the drug-resistant properties of chloropyridine and quinalphos are respectively delayed, and the usage amount of drug is small; under the mutual action of sodium methyl cocoyl taurate, chloropyridine and quinalphos, the drug effect is further improved, the stability is realized, and the easiness in decomposing is avoided. The preparation method has the advantage that the Paichongding(1-((6-chloropyridin-3-yl)methyl)-7-methyl-8-nitro-5-propoxy-1,2,3,5,6,7-hexahydroimidazo[1,2-a]pyridine) and the sodium methyl cocoyl taurate are firstly heated and mixed, and then are slowly mixed with the quinalphos, so that the uniformity and stability of the composition are ensured.