Based on the provincial level panel data in China from 2013 to 2020, the paper analyzes the influence mechanism and heterogeneity of digital economy on the high-quality development of green economy. The results show that digital economy can effectively promote the high-quality development of green economy, digital economy promotes high-quality development of green economy by upgrading of industrial structure and technological innovation. The influence of digital economy on the high-quality development of green economy is more significant in the eastern and central regions, but not in the western and northeast regions. With policy support, digital economy has a greater impact on the development level of green economy, policy advantages can enhance the impact of the digital economy on the high-quality development of the green economy. Therefore, it is suggested to speed up the innovation of digital economy infrastructure and technology, steadily promote the coordinated deve-lopment of regional digital economy, deepen the integration of digital economy and green economy, so as to promote the high-quality development of green economy.