Small integrated sewage treatment system

The utility model discloses a small integrated sewage treatment system. Box body, wherein a grating tank, an adjusting tank, a biological reaction tank and a sedimentation tank which are communicatedwith one another are sequentially arranged in the box body from left to right; a water inlet pipe is mounted at one end of the box body; the water inlet pipe is connected with one end of the grid pool; a submersible sewage pump is mounted in the adjusting tank; a water outlet of the submersible sewage pump is communicated with the top of the biological reaction tank through a water feeding pipe; through layer-by-layer filtration of the grating tank, the regulating tank, the biological reaction tank and the sedimentation tank, the sewage purification efficiency is greatly improved, the structural design is reasonable, the device is suitable for popularization, a filler turntable is designed in the biological reaction tank, and a light filler commonly used in the biological filter tank is filled in the turntable as