NOVELTY - Bioreactor based on automatic float sludge crushing and circulation comprises a separation area, a reaction area and a water distribution area, which are connected in series. The separation area comprises an exhaust port (1), an air chamber (2), a water outlet (3), a sludge circulation barrel (4), an annular settling pond (5), a guide slot, liquid spray pipe, a cross spacer plate, a float sludge collection chamber and a dredging tube. The separation area is connected with e.g. the exhaust port, the air chamber, water outlet, the sludge circulation barrel and float sludge collecting chamber.    USE - Used as a bioreactor based on automatic float sludge crushing and circulation.    ADVANTAGE - The bioreactor is safe and suitable for removing air bubbles attached to the surface of the bioreactor, removes granular sludge inside the airbag, and recycles sediment of floating granular sludge.    DETAILED DESCRIPTION - Bioreactor based on automatic float sludge crushing and circulation comprises a separation area, a reaction area and a water distribution area, which are connected in series. The separation area comprises an exhaust port (1), an air chamber (2), a water outlet (3), a sludge circulation barrel (4), an annular settling pond (5), a guide slot, a liquid spray pipe, a cross spacer plate, a float sludge collection chamber and a dredging tube. The separation area is connected with the exhaust port, the air chamber, the water outlet, the sludge circulation barrel, the cross spacer plate and the float sludge collecting chamber from top to bottom. The cross spacer plate is provided with the liquid sprayer on the upper surface and dredging tube on the lower surface. The annular settling pond is provided with the air chamber and the sludge circulation barrel. The upper end of the annular settling pond is provided with the water outlet and the lower end is provided with the guide slot. The lower end of the water distribution area is provided with a water distributor.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of the bioreactor based on automatic float sludge crushing and circulation.    Exhaust port (1)    Air chamber (2)    Water outlet (3)    Sludge circulation barrel (4)    Annular settling pond (5)