Environmental protection is an important task in the construction of ecological civilization and the creation of a civilized model city. The pro environmental behavior of residents is directly related to the development and results of environmental undertakings. However，existing research on how policy intervention and environmental norms affect pro environmental behavior lacks a clear and complete explanatory chain，and the role of internet use in the digital age has not been explained. This article is based on the China Comprehensive Social Survey（CGSS）data for objective measurement and empirical analysis，exploring the causal relationship between environmental policy perception，environmental norms，and pro environmental behavior. The results indicate that environmental policy perception has a significant positive impact on green citizenship behavior and public pro environmental behavior，and environmental norms play a mediating role. In the digital age，the perception of policy intervention affecting pro environmental behavior through environmental norms is moderated by the frequency of internet use. The higher the frequency of internet use，the stronger the regulatory effect. Therefore，in promoting the construction of urban ecological civilization in the digital era，we should actively play the role of institutional guidance and policy propaganda，and shape good environmental value norms from top to bottom；More emphasis should be placed on the application of digital technology，especially in the areas of low and medium internet usage，which can help promote pro environmental behavior among citizens in both private and public domains. This study aims to promote the construction of urban ecological civilization in the digital age from the perspective of policy perception and environmental norms，and create a new era of ecological civilization governance pattern of co-construction，co-governance，and sharing.