Aquatic plant purification system and device suitable for non-navigable river channel

The invention discloses an aquatic plant purification system and device suitable for a non-navigable river channel, and belongs to the field of environmental protection. The aquatic plant purificationdevice comprises a support frame, aquatic plants, a network structure and mooring anchors, wherein the support frame comprises a frame and a carrier and is formed by PE (polyethylene) pipes which areconnected by four-way valves and elbows, and are sealed each other by using an adhesive, so that the buoyancy force generated by the support frame is greater than the weight of the support frame; theaquatic plants are planted in the grid area of the support frame; and the device is relatively fixed relative to the water bottom or both shores by the mooring anchors. When water bodies N and P areV types, the ratio of hydrocotyle verticillata to myriophyllum spicatum L. is 7:3; when the water bodies are inferiorly V types, the ratio of the hydrocotyle verticillata to the myriophyllum spicatumL. is 3:7; and when the water