Environmental air quality monitoring is an important part of environmental protection work,which is of great significance for timely understanding of air quality and prevention and control of pollution.With the development of technology,automatic monitoring of ambient air has become the mainstream monitoring method.However,how to ensure the accuracy,reliability and comparability of automatic monitoring data is an important problem at present.Based on the significance and present situation of quality control of ambient air automatic monitoring,this paper deeply studies the quality control methods and measures of ambient air automatic monitoring.These measures are aimed at improving the accuracy of monitoring data and ensuring its effective application in environmental management and decision-making.