Method for purifying water quality of eutrophicated lake water body and special purification device

The invention discloses a method for purifying water quality of eutrophic lake water and a special purification device, and the method comprises the following steps: firstly, pollutants in a water body are removed; afterwards, green plant modules are arranged on the water surface, a plurality of green plant units of each green plant module are connected with a supply barrel through guide pipes, and the guide pipes are provided with permeation medicine bags; the supply barrel and the permeable medicine bags are filled with liquid medicine; after 5-7 days, liquid is added into the supply barrel, and the medicine liquid in the permeable medicine bags is replaced; the step S4 is repeated for multiple times until the water quality is tested to reach the standard; the device comprises a machine body and a collecting purifier, a power mechanism drives a propeller to rotate, a plurality of power wheels on the machine body are driven by the power mechanism to rotate, a water pump is arranged on the machine body; the c