The invention discloses a sewage sedimentation treatment device which comprises a box body, a feeding hole formed in the upper part of the box body, a stirring mechanism arranged at the upper part inthe box body, a scraping mechanism arranged below the stirring mechanism, a water collecting mechanism arranged below the scraping mechanism and a water collecting recovery tank arranged below the water collecting mechanism, the water collecting mechanism comprises an air pump, a telescopic pipe arranged at the upper part of the air pump and a U-shaped pipe arranged on the telescopic pipe, the center of the U-shaped pipe is a symmetry axis, filter plates are arranged on the left side and the right side of the U-shaped pipe, a water absorption part is arranged above the filter plates, and an arch-shaped plate is arranged outside the water absorption part in a sleeving mode. The water absorption part can move up and down in the arch-shaped plate, sediment recovery tanks are arranged on the left side and the right side of the arch-shaped plate, through the arrangement of the water absorption mechanism, clean water can be discharged out of the independent box body, secondary pollution of the water is avoided, and the quality of water precipitation is improved through additives.