Four-pond three-dam type culture tail water ecological treatment system

The utility model discloses a four-pond three-dam type culture tail water ecological treatment system which comprises a first aquatic animal filter pond, a first transition pond, a second aquatic animal filter pond, a second transition pond, an aquatic plant filter pond, a third transition pond and a mixed filter pond which are connected in sequence, a plurality of filter-feeding shellfish filter screen walls are arranged in the first aquatic animal filter tank and the second aquatic animal filter tank, and each filter-feeding shellfish filter screen wall comprises a plurality of fixed rods fixed at the bottom of the first aquatic animal filter tank and a plurality of shellfish culture nets for culturing filter-feeding shellfish; a metal net cage for breeding aquatic animals and a floating bed for planting the aquatic animals are arranged in the mixed filter tank; a plurality of water flow propellers are arranged in the first aquatic animal filter tank, the second aquatic animal filter tank, the aquatic plant