Sewage treatment system for low-carbon-nitrogen-ratio rural sewage

The utility model provides a sewage treatment system for low-carbon-nitrogen-ratio rural sewage. The sewage treatment system comprises a sewage collecting tank, a filtering chamber, an anoxic chamber, an anaerobic chamber, an aerobic chamber and a settling chamber which are sequentially communicated in the water flow direction of sewage treatment, a filter membrane is obliquely arranged in the filter chamber, a valve is arranged on the side wall, connected with the lower end of the filter membrane, of the filter chamber, the valve is arranged above the joint of the filter chamber and the lower end of the filter membrane, and a filter residue pool is arranged at the bottom of the outer side face of the filter chamber; flowmeters are arranged on pipelines between the sewage collecting tank and the filter chamber and between the filter chamber and the anoxic chamber, and the flowmeters and the valves are connected with a controller; the anoxic chamber is filled with activated sludge, scrap iron, sponge biologica