The present invention relates to the field of agricultural fungicides. Disclosed are a fused heterocycle structure-containing compound, a preparation method therefor and applications thereof, and a fungicide. The fused heterocycle structure-containing compound has the structure as represented by formula (1), formula (2), or formula (3). The compound of the present invention provides excellent control effects with respect to plant diseases caused by various oomycetous pathogens such as Phytophthora infestans, Phytophthora capsica, Pythium ultimum, Phytophthora nicotianae, Phytophthora litchi, and Pseudoperonospora cubensis, is obviously better than conventional oomycosis control agent dimethomorph, and has great market development prospects.
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