The invention relates to the technical field of electronics, in particular to an indoor air quality control system. The indoor air quality control system comprises a micro-processor system. The signal input end of the micro-processor system is connected with a VOC concentration sensor used for detecting indoor air quality. The signal output end of the micro-processor system is connected with an air exchange system used for discharging out indoor air or conveying fresh air into a room. According to the indoor air quality control system, the work condition of the air exchange system is controlled according to data monitored by the VOC concentration sensor.