Self-adaptive reoxygenation-free device

The utility model belongs to the field of water treatment equipment, and particularly relates to a self-adaptive reoxygenation-free device. The device comprises a diversion unit, a pressurized water unit and a falling weir. The falling weir is arranged on the upstream side of the partition wall, a water passing weir is formed when water flows over, and water passing holes are formed in the partition wall. The flow guide unit is located on the drop water side of the partition wall, and the water pressing unit is arranged above the flow guide unit and used for being attached to and pressing down drop water. According to the water pressing unit, convection between sewage and air in the free falling process is avoided, water and gas mixing caused by violent collision between a water column and the liquid level is avoided, the reoxygenation-free effect is good, the nitrogen and phosphorus removal reaction efficiency can be improved, and the agent cost for adding an external carbon source is reduced. The device can