Induction type aquatic organism collection and water body purification device

The utility model discloses an induction type aquatic organism collection and water purification device which comprises an induction type artificial fish nest and a bottom layer organism collection device which are connected into an integral structure through an anchoring rope, the induction type artificial fish nest comprises an upper layer module and a lower layer module, wherein the upper layermodule comprises a floating island module, aquatic plants and an upper frame; the lower layer module comprises a lower frame, a viscous egg attachment module and a viscous egg attachment matrix; attaching a raw diatom attachment plate; wherein the bottom layer biological collection device comprises an upper shell, a lower shell and a plurality of biological collection devices, the upper shell isa shell-shaped curved shell, and a plurality of round holes are uniformly formed in the upper shell; the lower shell is filled with a gravel layer, fixed pebbles and movable pebbles in sequence from bottom to top, and flow gui