Air conditioning cabinet for controlling indoor air pollution in haze days and operating method thereof

The invention discloses an air conditioning cabinet for controlling indoor air pollution in haze days. A fresh air pipe, an air supplying pipe and an air returning pipe are respectively communicated with the air conditioning cabinet, the fresh air pipe is communicated with a fresh air filtering section inside the air conditioning cabinet through a valve, and the fresh air filtering section is divided into an upper fresh air channel and a lower fresh air channel which are independent. A first fresh air valve, at least two levels of fresh air filters, a fresh air draught fan and a second fresh air valve are sequentially arranged inside the upper fresh air channel in the air supplying direction. The filtering efficiency of the two levels of fresh air filters increases gradually in the air supplying direction. A third fresh air valve, a first fresh air filter and a fourth fresh air valve are sequentially arranged inside the lower fresh air channel in the air supplying direction. Under normal working conditions, fresh air enters a mixing section from the lower fresh air channel. In the haze days, the fresh air enters the mixing section from the upper fresh air channel, and therefore the indoor particulate pollution in the haze days is controlled, the resistance of an air conditioning system in the normal working conditions is not increased, operation is economical, and control is easy and convenient.