The invention relates to the field of algicide, in particular to a cyclo neryl alkane type hydroxamic acid derivative from algae endophytic fungi, a preparation method of the cyclo neryl alkane type hydroxamic acid derivative and application thereof in algal inhibition. The structure of the cyclo neryl alkane type hydroxamic acid derivative is as shown in formula (I). The preparation method of thecyclo neryl alkane type hydroxamic acid derivative comprises the steps of inoculating algae endophytic fungus trichoderma asperellum A-YMD-9-2 in a fungus medium and carrying out fermentation culture, and separating and purifying a fermented product to obtain the cyclo neryl alkane type hydroxamic acid derivative as shown in formula (I). Through microalgae activity inhibition experiments on the obtained cyclo neryl alkane type hydroxamic acid derivative, it shows that the median inhibitory concentration of the compound to microalgae can reach 5.1 micrograms/millimeter.
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