Integrated clean room air purification system and control method

The invention discloses an integrated clean room air purification system and a control method. The integrated clean room air purification system comprises a purifier shell, and a middle-layer plate is fixed to the middle position of the purifier shell; a heat exchanger and an electromagnetic air valve are embedded in the middle-layer plate; the heat exchanger and the electromagnetic air valve enable the upper layer and the lower layer of the purifier shell to communicate; a filtering assembly is arranged at the lower layer of the purifier shell; after the AUTO touch key is pressed down, indoor air is monitored through the indoor PM2.5 sensor, outdoor air is monitored through the outdoor PM2.5 sensor, the ratio of the indoor air cleanliness to the outdoor air cleanliness is compared through monitoring values of the indoor PM2.5 sensor and the outdoor PM2.5 sensor, when the indoor air is dirty, the second ventilation mode is repeated for ventilation, and when the indoor air is not dirty, the second ventilation