The invention discloses a dust-free air conditioner, which belongs to the technical field of electrical appliances of air conditionings. In the dust-free air conditioner, a metal box body is internally separated into a and b air channels by baffle plates, an evaporator, an outdoor unit conventional air conditioning structure and a water circulating system, wherein the evaporator is connected with the outdoor unit conventional air conditioning structure and the water circulating system. The invention is characterized in that the water circulating system is internally provided with a dedusting device. When the indoor air temperature is conditioned, simultaneously dust-free process and sterilization are performed, which overcomes the defaults of purifying air by methods of traditional filters, medicinal methods, ultraviolet ray and the like, further, the humidity of the rooms can be regulated, and, the air conditioner has the function of dust removal, sterilization, energy recovery of condensed water, non-out-flow of the condensed water and the like, thereby the indoor air quality is promoted, bacteria and viruses which exist in the air and transmit diseases are eliminated, various infectious diseases occurred in air conditioning rooms are effectively prevented, and the indoor air is enabled to be more sanitary and safer. The air conditioner has huge environmental protection effect and markets.