Sludge discharge device capable of preventing sludge from floating upwards for sewage treatment

The utility model provides a sludge discharge device for sewage treatment and capable of preventing sludge from floating upwards, and relates to the technical field of sewage treatment. The sewage treatment sludge discharge device capable of preventing sludge from floating comprises a sludge discharge pipe and further comprises a filter assembly, the filter assembly is embedded in the sludge discharge pipe, and the filter assembly is used for isolating sludge in sewage; the sealing plate is embedded in one side of the sludge discharging pipe, and the sealing plate is used for filling a gap between the filtering assembly and the sludge discharging pipe. The sludge discharge device capable of preventing the sludge from floating upwards for sewage treatment is provided with the filter assembly which is arranged in the sludge discharge pipe and is of a Z-shaped structure, when sewage flows through the containing cavity of the sludge discharge pipe, the sludge can be limited at the position below the containing ca