The utility model discloses a processing apparatus of outer cold water feedwater of current conversion station, line mixer and water purifier including being used for raw water and water purification agent to mix still include ion exchanger, the water purifier connect in line mixer's exit end, pond in the middle of the exit end of water purifier is connected with is connected to this ion exchanger's top at the exit end in this centre pond through the elevator pump, and this ion exchanger's bottom intercommunication current conversion station is the cold water feed pipe outward. The beneficial effect of the utility model: it effectively prevents at pipeline scale deposit, former water treatment degree of automation height to go out water quality of water height.