Disclosed is a sea cucumber youngling benthic ecosystem temporary aquaculture method. A shellfish temporary aquaculture meshed cage is supported by a bamboo pole or sealed plastic pipe; a meshed bag or meshed sheet where sea cucumber younglings hung is placed into a meshed bag with meshes smaller than those of the meshed bag of the sea cucumber younglings; the meshed bag and floaters are placed into the shellfish temporary aquaculture meshed cage, sandbags are connected to two ends of the meshed cage through connecting ropes, one end of the meshed cage is connected to a raft to form a device through a hanging rope, the certain distance is maintained between the device and the meshed cage when tidal bore is eliminated, the distance between the meshed bag and seabed is decreased when the flow speed of the tidal bore is large, more possibilities are provided to sand and mud for entering the meshed cage when the meshed cage gets close to the seabed, and adequate nutrients are clung to the meshed bag or meshed net for the sea cucumber younglings. The method has the advantages that the technology blanks of sea cucumber youngling marine ecosystem aquaculture and sea cucumber benthic ecosystem aquaculture can be filled, and a complete industry chain of sea cucumber ecological aquaculture is acquired.