The present invention belongs to the fields of insecticides, acaricides and fungicides, and particularly relates to a piperonylic acid derivative, and preparation and application thereof. The structure is shown in a general formula I, and the definition of each substituent in the formula is described in the description. The compound of the general formula I exhibits excellent insecticidal, acaricidal and fungicidal activity and can be used for controlling various harmful insects, mites or fungus.