The invention discloses an air conditioner evaporator water washing control method. The method comprises the following steps: a water adding water pump is controlled to start, feeds water, flowing from a water tank in a water channel, into a water adding pipe, and controls the water adding pipe to inject the water in an evaporator to clean the evaporator; after the water adding water pump is started by first preset time, the water in a water receiving disc is drained to the external of the air conditioner; and spacing by second preset time, the water in the water receiving disc flows into the water channel through a water outlet thereof to realize circular water washing. The invention further discloses an air conditioner evaporator water washing control device and the air conditioner. When the cleaning of the evaporator of the air conditioner is guaranteed, the resource waste is prevented through water recycling, and resources are saved when improving indoor environment.