Purification device for river and lake water quality and water ecology

The utility model discloses a purification device for river and lake water quality and water ecology, which comprises a driving mechanism and two retaining dams, the two retaining dams are respectively and fixedly arranged on the bottom surface of a river channel, and the two retaining dams are arranged oppositely and are respectively and fixedly connected with the driving mechanism; a filter box is arranged on one side of each dam, one side of the filter box is fixedly connected and communicated with an algae collecting unit used for collecting algae floating on the water surface, the algae collecting unit is fixedly connected with the side face of any dam, an inner cavity of the filter box is rotationally connected with a filter assembly used for filtering the algae, and the filter assembly is in transmission connection with a driving mechanism. The bottom end of the filter box communicates with the downstream of the riverway; the filter box and the algae collecting unit are arranged on the downstream side