The invention relates to the field of insecticides and bacterial inhibitors, in particular to an alga endophytic fungus sesquiterpene compound and a preparation method and application thereof. The specific structural formula is shown as a formula (I). The preparation method of the alga endophytic fungus sesquiterpene compound comprises the steps of inoculating aspergillus versicolor DL-29 in a fungus liquid culture medium for fermentation and culture and purifying fermentation products to obtain the alga endophytic fungus sesquiterpene compound shown as the formula (I). According to insecticidal activity experiments, the obtained alga endophytic fungus sesquiterpene compound has the advantages that the fatality rate of artemia is 73.8 percent when the concentration of the compound is 100 micrograms per milliliter, the lethal concentration is 35.0 micrograms per milliliter when the fatality rate of artemia is 50 percent, and the bacteriostatic activity is remarkable. The formula (I) is shown in the description.
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