The invention discloses application of 4-tertiary butyl-5-(1,2,4-triazole-1-base)-2-benzyliminothiazole as shown in a chemical structural formula I in the preparation of insecticides, wherein X in the chemical structural formula I is selected from hydrogen, 2-chlorine, 2-fluorine, 2-hydroxy, 2-methoxyl, 2-ethyoxyl, 2-nitryl, 3-dimethylamino, 3-chlorine, 3-bromine, 3-fluorine, 3-methyl, 3-ethyl, 3-trifluoromethyl, 3-hydroxy, 3-methoxyl, 3-ethyoxyl, 3-nitryl, 3-sulfonic group, 3-methanesulfonylamino, 3-sulfamoyl, 4-dimethylamino, 4-chlorine, 4-bromine, 4-fluorine, 4-methyl, 4-ethyl, 4-trifluoromethyl, 4-hydroxy, 4-methoxyl, 4-ethyoxyl, 4-acetoxyl group, 4-nitryl, 4-sulfonic group, 4-methanesulfonylamino, 4-sulfamoyl, 2-chlorine-5-nitryl, 3-ethyl-4-hydroxy, 3,4-dimethoxy, 2,4-dichloro, 2-hydroxy-5-bromine, 2-hydroxy-5-iodine, 2-hydroxy-5-chlorine, 2,4-difluoro, 2-hydroxy-3,5 dibromo, 2-hydroxy-3,5 diiodo, 2-hydroxy-3,5 dichloro or 2-hydroxy-3,5 difluoro.