Floating island type constructed wetland treatment system based on lake center platform

The invention discloses a floating island type constructed wetland treatment system based on a lake center platform, and relates to the fields of eutrophic water pollutant ecological interception, water quality improvement and decentralized sewage treatment. The system comprises a water purification lake center platform, a water inlet subsystem comprising a plurality of water inlet filler columns, a water drainage subsystem comprising one or more drainage filler columns, a water collection and distribution subsystem comprising a plurality of water collection tanks, and a platform wetland subsystem; the drainage filler columns are located in the center of the bottom of the water purification lake center platform, and the multiple water inlet filler columns are evenly distributed on the edge of the bottom of the water purification lake center platform with the drainage filler columns as the center; the platform wetland subsystem is located in the center area of the upper surface of the water purification lake c