Provided are m-diamide compounds and a preparation method therefor and the use thereof. The m-diamide compounds have a structure represented by formula I. The m-diamide compounds of the present invention can have a high insecticidal activity at a low dose and take effect rapidly, can exert the insecticidal activity one day after application, can achieve a high insecticidal activity within three days, and have a good fast-acting property; moreover, due to the good effect at a low dose, the m-diamide compounds can reduce the damage to plants and human beings caused by excessive drug concentrations, enable less drug residue to be generated during application which is more conducive to environmental protection, and have broad application prospects.