The invention, relating to the field of pesticides, particularly discloses a seaweed acetyl sesquiterpenoid of formula (I), its preparation and application. The preparation method comprises the following steps : drying Laurencia composita and crushing, then using an organic solvent to extract to obtain a crude extract; carrying out silica gelcolumn chromatography on the crude extract, using an organic solvent to conduct gradient elution, and separating and purifying the eluate ingredient under gradient elution with the volume ratio of 60-30 : 1 to obtain the target compound (I). According to the invention, insecticidal activity experiments show that when the concentration of the obtained sesquiterpenoid disclosed herein is 100mug/ml, the fatality of artemia is 74.6%, and the lethal concentration of 50% is 51.1mug/ml.
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