The invention provides an insecticidal composition for controlling the sanitary insect pests such as mosquitoes, flies, blattella germanica, and the like. The insecticidal composition comprises a component (A) dichlor dimefluthrin and a component (B) 2, 3, 5, 6-tetrafluoro-4-methoxyl methyl benzyl-3-(3, 3, 3-trifluoro-propenyl)-2, 2-dimethyl propane carboxylate, wherein, the mass ratio between the component (A) and the component (B) is 1:20 to 99:1. The coil type mosquito repellent incenses, the electric mosquito-repellent mats, the electric mosquito repellent vaporizer, the insecticide aerosol and other products which are prepared by using the insecticidal composition have the advantages of rapid killing to the insect pests and long-term drug effect.