The invention relates to the field of algicides, in particular to a cyclonerotdol acylated derivative from alga endophytic fungi, a preparation method of the cyclonerotdol acylated derivative and application of the cyclonerotdol acylated derivative in alga inhibition. The specific structural formula is shown in the formula I, and the preparation method comprises the steps that the alga endophyticfungus trichoderma asperellum A-YMD-9-2 is inoculated into a fungi medium for fermentative cultivation, and after the fermented product is subjected to separation purification, the cyclonerotdol acylated derivative shown in the formula I is obtained. According to the cyclonerotdol acylated derivative obtained by using the preparation method, through a microalgae inhibition activity experiment, itis shown that the median inhibitory concentration of the compound to microalgae can reach 5.2 microgramms/milliliter.
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