Induced type hydrobios collecting and water purifying device

The invention discloses an induced type hydrobios collecting and water purifying device. The induced type hydrobios collecting and water purifying device comprises an induced type artificial fish spawning nest and a bottom biology collecting device which are connected integrally through an anchoring rope, wherein the induced type artificial fish spawning nest comprises an upper module, a lower module, a consolidation diatom attaching plate; the upper module comprises floating island modules, aquatic plates and an upper frame; the lower module comprises a lower frame, viscid egg attaching modules and viscid egg attaching matrix; the bottom biology collecting device comprises an upper housing and a lower housing, wherein the upper housing is a curved surface housing in the shape of a shell,and a plurality of circular holes are uniformly formed in the upper housing; and a gravel layer, fixed pebbles and movable pebbles are sequentially stuffed in the lower housing from bottom to top, anddiversion blades are resp