Aquaculture circulating water treatment device

The invention relates to the technical field of aquaculture, and discloses an aquaculture circulating water treatment device, which comprises a culture tank, a filter tank, an ecological treatment system, a magnetic coagulative precipitation tank and a denitrification deep-bed filter tank communicated in sequence. The denitrification deep-bed filter tank is communicated with the culture pond, the filter tank is used for filtering visible pollutants with large volumes, such as residual feeds and excrement, and the ecological treatment system is used for adsorbing, intercepting and biologically flocculating the pollutants, so that the pollutants are converted and absorbed, the content of organic matters in culture water is reduced, the magnetic coagulative precipitation tank is used for adsorbing and precipitating bacteria, viruses, oil and various tiny particles in aquaculture water, removing SS and clarifying the water body, and the denitrification deep-bed filter tank has a denitrification function and a fun