Deep efficient purification system for water body

The invention discloses a deep and efficient purification system for a water body. The deep and efficient purification system comprises a coagulating settling device, a plasma denitrification device and an adsorption dephosphorization and phosphorus recovery device, the water body is preliminarily treated in advance through the coagulating settling device, the plasma denitrification device comprises a plasma generator and a denitrification reaction tank, a water inlet and an outlet of the plasma generator are respectively connected with the coagulating settling device and the denitrification reaction tank, the adsorption phosphorus removal and phosphorus recovery device comprises an adsorption tower, a desorption regeneration system and a phosphorus precipitation recovery system, wherein awater inlet of the adsorption tower is connected with an output end of the denitrification reaction tank, the desorption regeneration system is connected to the adsorption tower and stores eluted recovery liquid in a phospho