The invention discloses a feed feeding purifier capable of treating pollutants and clearing rubbish in water by using nano-bubbles. A rotating cover is arranged at the upper middle end of a floating air bag; a rotating motor is arranged on the lower side of the rotating cover, a driving shaft is arranged at the upper end of the rotating motor, a driving belt wheel is arranged at the lower end of the driving shaft, a storage box is arranged at the right upper end of the floating air bag, a sealing bin is arranged at the lower end of the storage box, a micro-nano bubble generator is arranged on the left side of the storage box, a bubble discharge guide pipe is arranged at the bottom end of the micro-nano bubble generator; a material mixing belt wheel is arranged at the upper end of the storage box, a feeding pipe is arranged at the lower end of the storage box, a rubbish storage and transportation bin is arranged at the rear bottom end of the floating air bag, and a rubbish transportation stirring cage is arranged in the rubbish storage and transportation bin. The purifier is simple in structure and complete in function, and can be widely used for fish ponds, feeding of the fish ponds and pollution treatment of the cultural landscape lake, and can be used for treating reservoirs, river and offshore oil leakage.