The invention relates to the field of marine natural antifouling agents, and particularly relates to a sponge diterpene compound, a preparing method thereof and applications of the diterpene compound in marine antifouling agents. The structure of the diterpene compound is shown as a formula I. The preparing method includes washing hymerhabdia intertidal sponge with seawater, removing sand attached to the surface and attached materials, cutting into small blocks, freeze-drying, smashing, digesting with an organic solvent, extracting with solvents, and performing repeated column chromatography separation to obtain the compound shown as the formula I. The diterpene compound is a small-molecule natural organic compound with a novel structure, and can be prepared easily. The diterpene compound has obvious activity for resisting marine organism fouling, and can be used for preparing efficient marine antifouling agents.
; 杨翠云
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