Purpose/Significance To explore the application advantages, paths and problems of big data technology in monitoring and early warning of infectious diseases and emergency response of public health emergencies. Method/Process Taking the public health data platform of Hebei Center for Disease Control and Prevention as an example, from the aspects of data platform construction ideas, existing problems and suggestions, the paper discusses how to use big data information technology to make more comprehensive, rapid and rational use of data of infectious diseases and public health emergencies, and improve the capacity of monitoring, analysis, early warning and emergency response. Result/Conclusion The application of big data technology in public health emergency management can provide data and technical support for quickly judging the spread of infectious diseases, timely cutting off transmission routes, and forming response strategies, so as to improve the capacity for monitoring and early warning of infectious diseases and the efficiency of early response to public health emergencies