The invention discloses an A20+MBR processing device, belongs to the field of environmental protection, and particularly relates to the field of wastewater biotreatment and reuse. The A20+MBR processing device includes an water inlet, an anaerobic pool, an anoxic pool, an aerobic pool, a membrane pool, an MBR membrane component, a spherical filler, an MBBR filler, a water outlet, an aeration head, an aeration branch pipe, an aeration main pipe, a gas adjusting valve, aeration equipment, a sludge reflux pipe, a nitrifying liquid reflux pipe, a biological flow bed; the MBR membrane component is installed in the membrane pool; the nitrifying liquid reflux pipe is installed between the upper portion of the aerobic pool and the upper portion of the anoxic pool; the sludge reflux pipe is installed between the bottom of the membrane pool and the bottom of the anaerobic pool. The A20+MBR processing device has the advantages that the efficient solid liquid separation is achieved; the effluent water quality is good and stable; the remaining sludge amount is small; the covering area is small; a secondary settling tank is not needed; process equipment is concentrated; the device can be widely used in the field of urban and rural sewage treatment.