The invention discloses a novel inclined pipe sewage sedimentation tank which comprises a pollution discharge box, a motor box, pollution discharge switch devices, a mud scraping device, an inclined pipe sedimentation tank, mud pumping inclined pipes, a mud pumping box, mud pumping pumps and mud pumping pipelines; the motor box is arranged inside the pollution discharge box; the inclined pipe sedimentation tank is fixed on the top surface of the pollution discharge box; the pollution discharge switch devices are arranged on two sides of a junction of the inclined pipe sedimentation tank and the pollution discharge box; the mud scraping device is arranged on the inner bottom of the inclined pipe sedimentation tank; a fixed screen plate is fixed on the inner side walls of the inclined pipe sedimentation tank; a plurality of rows of the mud pumping inclined pipes are obliquely fixed on the top surface of the fixed screen plate; each of the mud pumping inclined pipes comprises an inclinedpipe body, sedimentation grooves, mud pumping cavities and mud pumping mouths; and the mud pumping mouths are connected with the mud pumping pumps through the mud pumping pipelines. Through the novelmud pumping inclined pipes provided with a plurality of the wave-type sedimentation grooves, the cleaning of the inclined pipes can be completed quickly and efficiently by utilizing the mud pumping pumps and the mud pumping pipelines without the need of downtime and manual cleaning, and secondary turbidity of a water body cannot be caused.