Rural sewage treatment device with adjustable area flexible design

The utility model relates to a rural sewage treatment device with adjustable area flexible design, which comprises a biochemical box and a sewage reflux pump, an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank which are sequentially communicated are arranged in the biochemical box, a material taking pipe inserted into the aerobic tank is mounted at an inlet of the sewage reflux pump, and a reflux pipe is mounted at an outlet of the sewage reflux pump. The return pipe is connected with a first branch pipe inserted into the anaerobic tank and a second branch pipe inserted into the anoxic tank, the first branch pipe is provided with a first flow valve, and the second branch pipe is provided with a second flow valve. The device has the beneficial effects that a multi-point reflux system is formed by adopting a simple pipeline structure design and setting reflux points of the anaerobic zone and the anoxic zone, so that flexible controllability and process adjustment of a biochemical reacti