The invention relates to a circulation flow ring-shaped multi-section soil film symbiotic combined type bio-reactor and a sewage treatment process thereof. The reactor comprises an anaerobic zone, two or more stages of aerobic-anoxic matching zones and a settling zone. Each aerobic-anoxic matching zone comprises an anoxic zone and an aerobic zone which are sequentially established. A suspended filler zone is arranged in each aerobic zone. A sewage injection opening and a sludge injection opening are formed in the anaerobic zone. A sewage injection opening is formed in each anoxic zone. A sewage outflow opening and a sludge discharge opening are formed in the settling zone, and the sludge discharge opening is connected with the sewage injection opening of the anaerobic zone through a returned sludge pipeline. By the adoption of the circulation flow ring-shaped multi-section soil film symbiotic combined type bio-reactor sewage treatment process, through optional combination of the reactor, efficient nitrogen and phosphorus removal, tank volume control, floor space decrease, construction cost reduction and operating cost reduction can be effectively achieved.