An air conditioner fan mainly comprises a base, a main unit and a top cover which are relatively independent. The main unit is placed on the base and covered by the top cover, the top cover can be lifted up from the main unit in case of need, and the main unit can further be individually lifted up from the base. A user can clean a filter screen and change water in the main unit at regular intervals by himself, so that the air conditioner fan is simple to maintain. The water and dense copper wires in the water replace a filter element to filter and cool air, repeated change of the filter element is omitted, and investment is reduced.