The invention relates to the field of algistats, in particular to a nitrogen-containing cyclic flores aurantii labdane sesquiterpene derivative as well as a preparation method and application in algaeinhibition. The structure of the nitrogen-containing cyclic flores aurantii labdane sesquiterpene derivative is shown in formula (I). The preparation method of the derivative comprises the followingsteps : inoculating seaweed endophytic fungus trichoderma asperellum A-YMD-9-2 into a fungal culture medium for fermentation culture, and separating and purifying a fermentation product to obtain the nitrogen-containing cyclic flores aurantii labdane sesquiterpene derivative represented by formula (I). A microalgae inhibition experiment of the nitrogen-containing cyclic flores aurantii labdane sesquiterpene derivative disclosed by the invention shows that the median inhibitory concentration of the compound for microalgae can reach 1.1 [mu]g/ml.
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