NOVELTY - A rural sewage treatment station of unit film and biological decomposition comprises biological treatment tank and membrane bioreactor. The biological treatment tank is embedded in ground. One side of inside part of biological treatment tank is separated with sewage deposition chamber. A sewage inlet is formed on upper part of outer wall of sewage deposition chamber. The partition wall of sewage deposition chamber is formed with sewage inlet.    USE - A rural sewage treatment station of unit film and biological decomposition.    ADVANTAGE - The rural sewage treatment station of unit film and biological decomposition has rational and compact design and structure, high sewage treatment efficiency, good discharged water quality, automatic operation, small area requirement, low investment and convenient use, can avoid active sludge, and is suitable for sewage treatment during cold and other seasons.    DETAILED DESCRIPTION - A rural sewage treatment station of unit film and biological decomposition comprises biological treatment tank and membrane bioreactor. The biological treatment tank is embedded in ground. One side of inside part of biological treatment tank is separated with sewage deposition chamber. A sewage inlet is formed on upper part of outer wall of sewage deposition chamber. The partition wall of sewage deposition chamber is formed with sewage inlet. The end of the other side in biological treatment tank is separated with regeneration water chamber having partition wall formed with outflow hole connected with biological treatment tank. The outer side of biological treatment tank, close to regeneration water chamber, is embedded with pit horizontal with top surface of biological treatment tank. The inside part of pit is provided with clear water tank with upper part provided with regeneration water pipe connected with regeneration water chamber. An overflow hole is formed on upper part of outer side of clear water tank. The membrane bioreactor is arranged at bottom of inside of clear water tank. A top cover plate is arranged at top of biological treatment tank and pit, except for deposition chamber. The top cover plate is overlapped with electric control operation chamber. Inside part of electric control operation chamber at one side of biological treatment tank is provided with fan for supplying oxygen and electrical cabinet. Outlet of fan is connected with one end of oxygen supply bus having pipe section that is distributed with branches for supplying oxygen towards inside part of biological treatment tank. The pipe section at the other end of oxygen supply bus is connected with hand valve. The end of oxygen supply bus runs through bottom part of partition wall of biological treatment tank, and enters into room between inner bottom surface of clear water tank and membrane bioreactor. The pipe section of oxygen supply bus, corresponding to bottom part of membrane bioreactor, is distributed with aeration nozzles facing upwards to supply oxygen. The other side in electric control operation chamber is provided with water pump with outlet connected with water supply pipe that is used for supplying clear water to outdoor part while inlet connected with pipe interface at one side of outlet pipe at top of membrane bioreactor via pipeline. The pipe section of outlet pipe is provided with hydraulic indicator, hand valve, flow gauge and another hydraulic indicator. The hand valve is connected on pipe section of outlet pipe between flow gauge and other hydraulic indicator via pipeline. The inner wall of case on one lateral ladder of upper part of clear water tank is provided with spare water pump that is supported by bracket. The inlet of spare water pump is connected with pipe interface at the other side of outlet pipe at top of membrane bioreactor via pipe. The outlet of spare water pump is connected with spare water supply pipe that is used for supplying clear water to outdoor part. The electrical cabinet is provided with remote-control circuit for ensuring normal operations of fan, water pump, membrane bioreactor and spare water pump.