Fresh air ventilator and control method thereof

The invention provides a fresh air ventilator and a control method thereof, and particularly relates to the technical field of fresh air ventilators. The fresh air ventilator comprises a heat exchanger; an air supply channel; an exhaust passage; the first sensor module at least comprises a first sensor used for detecting outdoor PM2.5 concentration; the second sensor module at least comprises a second sensor, a third sensor and a fourth sensor; the controller is configured to control the first sensor module and the second sensor module to periodically detect the outdoor PM2.5 concentration, the indoor PM2.5 concentration, the indoor VOC concentration and the indoor CO2 concentration; in the first operation mode, when the outdoor PM2.5 concentration is below a first preset concentration threshold value, the first fan and the second fan are controlled to operate at a first target air speed gear; the first target wind speed gear is determined by the indoor PM2.5 concentration, the indoor VOC concentration and th