Vertical flow type sedimentation tank

The utility model relates to a vertical flow type sedimentation tank which comprises a tank body, a water inlet device, a water outlet device, a mud baffle, a mud bucket, a mud discharge device and an emptying pipe, and the water inlet device comprises a water inlet pipe, a central cylinder, a horn mouth and a reflecting plate; the water outlet device comprises a water outlet weir and a water outlet hole; and the sludge discharge device comprises a sludge suction port, a sludge suction pipe, a vertical sludge discharge pipe, a sludge return pipe, a residual sludge discharge pipe and an air inlet pipe. According to the sedimentation tank, the mud suction pipes arranged around the mud bucket and the multi-point mud suction openings formed in the mud bucket in a staggered mode are arranged at the bottom of the tank body, so that dead zones at the bottom of the mud bucket are reduced, and the air stripping assembly is adopted, so that mud can be discharged, the mud suction openings can be subjected to air flushin