Circulating water aquaculture system based on microalgae

The invention discloses a circulating water aquaculture system based on microalgae, and belongs to the technical field of circulating water aquaculture systems. The circulating water aquaculture system comprises a culture pond, a purification pond and a controller, a U-shaped pipeline is buried at the lower sides of the culture pond and the purification pond, an opening of the U-shaped pipeline faces upwards, and vertical pipes at the two sides of the U-shaped pipeline are located in centers of the culture pond and the purification pond. When the device is used, a water body circularly flows between the purification pool and the culture pool through the U-shaped pipeline, the water body can be preliminarily purified through an arranged purification layer, high-quality microalgae communities can be cultured in an arranged annular microalgae pool, the microalgae communities are continuously provided for the culture pond, and the high-quality microalgae communities are used for purifyingthe culture water body. A