The invention relates to the field of algicides and specifically relates to a bicyclo-orange flower naphthene type sesquiterpene derivative as well as a preparation method thereof and application of the derivative in the aspect of algal inhibition. The structure of the derivative is shown by a formula (I) as shown in the specification; the preparation method of the derivative comprises the following steps : inoculating an endophytic fungi trichoderma asperellum in alga into a fungi medium for fermentation culture and separating and purifying a fermentation product to obtain the bicyclo-orange flower naphthene type sesquiterpene derivative shown by the formula (I). A microalgae inhibition experiment on the obtained bicyclo-orange flower naphthene type sesquiterpene derivative shows that themedian inhibitory concentration of a compound on microalga can reach 0.63mug/ml.
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