The invention provides a shallow sea cage apostichopus japonicus recirculating aquacultural facility and an aquacultural method. The shallow sea cage apostichopus japonicus recirculating aquacultural facility comprises a plurality of cages. The shallow sea cage apostichopus japonicus recirculating aquacultural facility is characterized in that the plurality of cages comprise small, medium and large aquacultural cages which are respectively used for aquaculture of small, medium and large juvenile apostichopus japonicus, the small, medium and large aquacultural cages are connected in proportional allocation that quantity of the small aquacultural cages is lower than quantity of the medium aquacultural cages and the quantity of the medium aquacultural cages is lower than quantity of the large aquacultural cages to form aquacultural units, and the aquacultural units are connected and then are fixed under the sea through piling. In March, April and May every year, the small, medium and large juvenile apostichopus japonicus are put into the cages to be cultivated according to specific density, and cultivation in each stage can provide enough juvenile apostichopus japonicus for the next stage; and then the small juvenile apostichopus japonicus are continuously supplemented and put into the cages, and the process is repeated, so that ecological efficient continuous product is realized. Aqucultural facility utilization rate is greatly improved, production cost is greatly reduced, growth rate of the juvenile apostichopus japonicus is improved, survival rate of the juvenile apostichopus japonicus is greatly improved, operation management is convenient, and comprehensive benefits are obviously improved.