Application of benzofuranol acrylketone derivative serving as insecticide

The invention relates to a benzofuranol acrylketone derivative represented by a chemical structural formula I or II or salt of the derivative. As shown in the description, the R is selected from hydrogen, deuterium, C1-C2 alkyl groups and C3-C4 straight-chain alkyl groups or branched-chain alkyl groups, the X1and X5 are selected from hydrogen, deuterium, C1-C2 alkyl groups, fluorine, chlorine, bromine, iodine or nitryl, the X3 is selected from hydrogen, deuterium, C1-C2 alkyl groups, fluorine, chlorine, bromine, iodine or nitryl, and the X2 and X4 are selected from hydrogen, deuterium and C1-C2 alkyl groups. The benzofuranol acrylketone derivative and the salt of the derivative are applied to insecticide preparation.