Fresh air control system

The invention discloses a fresh air control system, and belongs to the technical field of air conditioners. The fresh air control system comprises a main machine, a circulating air way, a humidity control system, an automatic air purification system, an indoor air quality control system, a dew-proof system, a frost-proof system and an automatic replacement reminding system, wherein the main machine is arranged outdoors, and the humidity control system, the automatic air purification system, the indoor air quality control system, the dew-proof system, the frost-proof system and the automatic replacement reminding system are electrically connected with the main machine and all controlled by the main machine. The fresh air control system has the beneficial effects that the system is applied to an air conditioner system, and adjustment and control can be automatically carried out according to changes of various indoor and outdoor environmental factors (such as the temperature, the relative humidity, the content of PM2.5, the content of carbon dioxide and the content of volatile organic compounds), so that the system can adapt to environment changes, and it is ensured that indoor persons are located in a comfortable, clean and safe environment all the time; and the service life of important components such as a filter screen, a heat exchange core and the like is controlled, the service life of the air conditioner system is further prolonged, energy consumption is reduced, and the cost is reduced.