Membrane bioreactor (MBR) is a new wastewater treatment technology which combines high efficiency membrane separation technology with biochemical technology. MBR membrane filtration of sludge containing sewage in the biochemical pool to achieve sludge separation, on the one hand, the membrane intercepts the reaction of microorganisms in the pool, the sludge concentration in the pool greatly increased, so that the biochemical reaction of degrading sewage is carried out more quickly and thoroughly; On the other hand, due to the high filtration precision of the membrane, the effluent is clear and transparent, and high quality water production is obtained.