The utility model relates to a support body of an MBR (Membrane Bioreactor) purification system. The support body is coated with a biomembrane and attachments thereof and is further connected with a vibration system and a backwash system, wherein the vibration system is composed of an air compressor and a high-frequency vibrator, and the backwash system comprises high-pressure air and a water nozzle. According to the utility model, the function of a bioreactor is enhanced by means of a membrane separation technology, and the support body has the advantages of simpleness for design and operation, good effluent quality, relatively small floor area and the like, and is particularly suitable for recycling of domestic sewage of urban high-rise buildings and residential communities. By means of treating sewage with the support body disclosed by the utility model, most harmful substances and dirt in the sewage can be treated, more than 90% of articulate organic matters in the sewage can be removed, 85% of COD (Chemical Oxygen Demand) and 80% of BOD (Biochemical Oxygen Demand) can be removed, and sewage purification can be realized.