Water treatment and circulation device for aquaculture

The water treatment and circulation device for aquaculture comprises a culture pond and a circulation reaction part, the circulation reaction part comprises a biochemical reaction tank, biological stuffing, an aeration assembly, a biochemical reaction tank top opening and a biochemical reaction tank bottom opening, and a gas collecting hood is arranged on the edge of the bottom of the biochemical reaction tank. The sectional area of the gas collecting hood is gradually increased, the biological filler is arranged on the inner wall of the biochemical reaction tank, the biological membrane can be attached to the biological filler, and the aeration assembly is arranged below the gas collecting hood. According to the utility model, water and high-density aquatic products are added into the culture pond from the top opening of the culture pond, the aeration assembly injects gas into the culture pond to form gas stripping, a gas-water mixture continuously rises to the inside of the biochemical reaction tank under t