The invention discloses a self-cleaning filter screen and an air conditioner, and relates to the technical field of air conditioner self-cleaning. The self-cleaning filter screen comprises a 
metal net, an insulating frame, an N-type 
semiconductor, a P-type 
semiconductor and a 
direct current power supply device, the 
metal net is arranged on the inner ring of the insulating frame, and one end of themetal net is connected with the insulating frame through the N-type 
semiconductor; and the end, away from the N-type semiconductor, of the 
metal net is connected with the insulating frame through theP-type semiconductor, the positive 
electrode of the 
direct current power supply device is electrically connected with the P-type semiconductor, and the negative 
electrode of the 
direct current powersupply device is electrically connected with the N-type semiconductor. The air conditioner comprises an indoor unit, a filter screen is arranged in the indoor unit, and the self-cleaning filter screenis adopted as the filter screen. The self-cleaning filter screen can automatically cool, 
frost, heat and defrost without disassembly or use of an electric heater, so that the cleaning is simple, convenient and quick; and the air conditioner uses the self-cleaning filter screen, maintenance is convenient, the refrigerating or 
heating effect is prevented from being reduced, and the user experienceis improved.