Abstract: Based on the existing small six-parameter air quality monitoring station in the scientific research base of a metrology institute, this paper builds a remote online intelligent calibration system for air quality monitoring. The system can realize regular, automatic, and high-frequency verification and calibration of gaseous pollutants SO₂, NO and CO in the environment, and has the functions of remote online dynamic monitoring and automatic data transmission. The experimental results show that the system operates reliably and stably and can meet the requirements of calibration specifications, and can be applied to the online calibration of atmospheric monitoring stations.