The utility model discloses a water processing system and cooling water circulation system, this water processing system includes first water pump, a reverse osmosis unit and water tank. The utility model discloses a water processing system utilizes the water of a reverse osmosis unit in to the circulating water to filter to filter wherein salinity, colloid etc. Because reverse osmosis technology belongs to the physical treatment mode, can filter the salinity that the type is more to compare with utilizing the filterable mode of medicament among the prior art, the filter effect is better.