Efficient and energy-saving sewage nitrogen and phosphorus removal device and process

The invention discloses a high-efficiency and energy-saving sewage nitrogen and phosphorus removal device and process, which are characterized in that multi-stage nitrogen and phosphorus removal of ammonia-nitrogen and phosphorus-containing wastewater is carried out through a double-sludge method and dominant bacteria independently existing in different process units, so that one carbon has multiple purposes, the carbon source addition is saved, the process energy consumption is low, the operation is stable, and the water outlet effect is good. Comprising a sludge anoxic tank, a first water distribution pipe, a second rapid sedimentation tank, a sludge return pipe, an anaerobic phosphorus release tank, a second water distribution pipe, a first rapid sedimentation tank, a sludge outlet pipe, a nitrosation tank, an anaerobic ammonia oxidation tank, an anoxic denitrification phosphorus absorption tank, a second rapid sedimentation tank, a first residual sludge discharge pipe, an aerobic tank, an anoxic tank, a s