Novel floating algae circulating water purification system

The utility model discloses a novel planktonic algae circulating water purification system which comprises a purification tank, an aeration device, a sewage collection tank and a circulating water pumping device, water inlets and water outlets are formed in the left side wall and the right side wall of the purification tank respectively, filter membrane plates are fixedly mounted on the left sideand the right side in the purification tank respectively, and a plurality of filter holes are evenly distributed in each filter membrane plate. A submersible lamp is hung in the purification pond, a blow-off pipe is connected to the bottom of the purification pond, the aeration device comprises a blast aerator, an air outlet of the blast aerator extends into the bottom of the purification pond, the circulating water pumping device comprises a first water pump and a second water pump, and one port of the first water pump is communicated with one of the water inlets and the water outlets througha water pipe. One port of