As an extension of ecological concepts, urban green development has gradually become a new bridge for various countries or regions to achieve sustainable development. Based on the panel data of 17 cities in Henan Province, China from 2007 to 2022, this article uses the entropy method to measure the green development level of cities in Henan Province, and uses the Dagum Gini coefficient method to analyze the green development differences between cities. The results show that: first, urban green development in Henan Province is generally at a lower-middle level and tends to be balanced. Second, there are obvious regional gaps in urban green development in Henan Province. Third, inter-regional disparity is the main reason for the differential distribution of urban green development levels in Henan Province. In order to promote the improvement of urban green level and narrow the spatial development gap in Henan Province, this study puts forward corresponding policy suggestions from the aspects of green investment, green technology innovation, industrial structure upgrading and green life. This also provides reference for other less developed regions in China to achieve balanced urban green development.