The invention discloses a novel sedimentation pool for a sewage plant. The novel sedimentation pool comprises a pool body, a water inlet pipe, a water distribution unit, a biological filling materialunit, a mud scraping device, a gas recovery device and a water outlet pipe, wherein the water distribution unit, the biological filling material unit, the mud scraping device, the gas recovery deviceand the water outlet pipe are arranged in the pool body; the mud scraping device comprises a mud scraping rod arranged at the bottom surface of the pool body, a driving rod fixedly connected with themud scraping rod, a rotating driving element used for driving the driving rod to rotate and a second driving element used for driving the driving rod to vertically act; the water distribution unit comprises a center pipe, a plurality of water distribution pipes and spray heads arranged on the water distribution pipe; the biological filling material unit comprises a first filling material assembly;the first filling material assembly comprises a fixing sleeve, a plurality of filling material frames and a biological filling material; the filling material frames are distributed at intervals in the peripheral direction of the fixing sleeve; the biological filling material is arranged on the filling material frame. The sewage is in sufficient contact with the biological filling; the biologicalfilling has a good anaerobic digestion treatment effect on the sewage; the sewage deposition quantity is reduced; the frequent mud scraping operation is not needed; the energy is saved; the environment is protected; the abrasion of the mud scraping component is small; the service life is long.