Three-dimensional recirculating aquaculture system

The utility model relates to a three-dimensional recirculating aquaculture system which comprises a pond, a purification area and a water return area are sequentially arranged in the pond in the water flow direction, the water return area is provided with a drainage channel communicated with the purification area, and the drainage channel is not communicated with the water return area; the three-dimensional culture pond is arranged close to the drainage channel, the three-dimensional culture pond comprises a pond body, a first fish blocking net, a sewage pumping pipe and at least one water inlet pump, the pond body is isolated from the pond, the first fish blocking net is arranged in the pond body and divides the interior of the pond body into a culture area and a sewage collection area, and the culture area is located above the sewage collection area; one end of the sewage pumping pipe communicates with the sewage collecting area, and the other end of the sewage pumping pipe communicates with the outside of