Low-consumption high-standard urban sewage treatment device and treatment method thereof

The invention discloses a low-consumption high-standard urban sewage treatment device, and relates to the technical field of sewage treatment. The device comprises a biological reaction tank and a secondary sedimentation tank, wherein the biological reaction tank comprises an anaerobic zone for feeding sewage, a plurality of anoxic zones and a plurality of aerobic zones; the anaerobic zone is connected with the first anoxic zone, and the anoxic zones are alternately connected with the aerobic zones; and the secondary sedimentation tank is connected with the last aerobic zone. According to theinvention, a continuous water inlet and continuous water outlet form is adopted for treating town sewage, microorganisms such as nitrifying bacteria, denitrifying bacteria, phosphorus-accumulating bacteria and the like enriched by the system under the condition of high sludge concentration are utilized, and effective utilization of a carbon source is realized through anaerobic shunting, so that the effluent can reach the