Self-cleaning composite filtering device, self-cleaning composite filtering fresh air system and control method

The invention discloses a self-cleaning composite filtering device, a self-cleaning composite filtering fresh air system and a control method.The self-cleaning composite filtering device comprises a device frame, a filter screen, a first discharge electrode and a second discharge electrode, the first discharge electrode and the second discharge electrode are arranged on the two sides of the device frame correspondingly, and the filter screen is arranged between the first discharge electrode and the second discharge electrode; the first discharge electrode and the second discharge electrode are high-voltage discharge electrodes with different polarities, when dust cleaning treatment is needed, a large amount of hardened dust deposits attached to the surface of the filter screen are effectively crushed by realizing cross-glow high-voltage discharge in the space of the filter screen, and meanwhile, the vibration of the filter screen and the vibration falling of dust are realized; the self-cleaning composite filt