The utility model discloses a floating type microporous aeration device, which adopts a lotus leaf shape imitating design, can float on the water surface and comprises an upper cover, a lower cover, afoaming plate, an anchor, an air inlet pipe, a microporous pipe and other parts. The front surface of the upper cover is circular, green and lotus-leaf-shaped and vein-like, the back surface of the upper cover is provided with a lip, the lip is provided with a groove, and a sealing ring is fixed in the groove; the lip is provided with a plurality of waterproof screws for fixing the upper and lower covers; a plurality of circular through holes are formed in the bottom end of the lower cover; a gas inlet pipeline is arranged on one side of the bottom of the lower cover to facilitate gas input from other equipment; an anchor is fixed at the bottom of the lower cover, so that the equipment is prevented from being washed away in flowing water; a plurality of foaming plates are placed in a cavity formed by the upper cover and the lower cover, so that the device is prevented from sinking into water after being soaked in water for a long time; the microporous pipe fixing seat is integrally cylindrical, and a plurality of air outlet holes are formed in the bottom end; one end of the microporous pipe is inserted into the air outlet, the other end of the microporous pipe is closed, and a plurality of fine air outlets are distributed in the middle and are regularly and spirally distributed.