The invention relates to the technical field of aquaculture, in particular relates to young sea cucumber raising techniques, and specifically relates to an ecological method for raising young sea cucumbers in offshore net cages. The method comprises the following steps of: making and putting raising net cages, selecting seed sea cucumbers, performing fertilization and hatching, raising larvae, raising young sea cucumbers, raising offshore in the winter, and stripping young sea cucumbers. The method selects natural sea areas for green ecological raising of young sea cucumbers, does not need any chemicals or artificial baits, utilizes abundant bait resources in natural sea areas, is energy-saving and environment-friendly, and achieves the purpose of natural and ecological raising of young sea cucumbers. The offshore raising method effectively reduces the raising cost, saves land resources, and reduces consumption of electrical energy and other energy sources. Besides, by virtue of natural selection and offshore overwinter, the quality of young sea cucumbers is improved and the aquaculture survival rate is increased.