The invention relates to the field of algistat, in particular to an acetylated nitrogen-containing cyclo-nerolialkene sesquiterpene derivative derived from seaweed endophytic fungi, a preparation method of the derivative and application of the derivative in the field of algae inhibition. The structural formula of the derivative is shown as a formula (I). The preparation method comprises the following steps : inoculating seaweed endophytic fungi (Trichoderma asprellum A-YMD-9-2) into a fungus culture medium for fermentation culture, and separating and purifying the fermentation product to obtainthe derivative shown as a formula (I). The acetylated nitrogen-containing cyclo-nerolialkene sesquiterpene derivative obtained by the invention can reach 6.6 micrograms/ml half inhibition concentration on microalgae according to a microalgae activity inhibition experiment.
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