The invention relates to the field of algae inhibitors, in particular to a chlorine-containing sesquiterpene derivative derived from seaweed endophytic fungi, a preparation method of the chlorine-containing sesquiterpene derivative and application of the chlorine-containing sesquiterpene derivative in algae inhibition. The preparation method comprises the following steps of : inoculating trichoderma virens RR-dl-6-8 into a fungus culture medium for fermentation culture; and separating and purifying a fermentation product to obtain the chlorine-containing sesquiterpene derivative shown in the formula (I), wherein the trichoderma virens RR-dl-6-8 is an endophytic fungus of seaweed. The chlorine-containing sesquiterpene derivative obtained by the invention is subjected to microalgae inhibition activity experiments to obtain that the half inhibition concentration of the compound on microalgae can reach 0.83 microgram/ml.
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