Worldwide, with the acceleration of urbanization and the increasing pressure on resources and environment, the waste of resources and the destruction of environment caused by the traditional building mode have become an important problem faced by urban development. Therefore, as a resource-saving and environment-friendly new building form, green building has been highly concerned by the government, enterprises and all sectors of society. Green building, with its environmental protection, resource saving and energy efficient characteristics, has a positive impact on the sustainable growth of urban economy. This paper will discuss the close relationship between green building and urban economy, and analyze the mechanism of their mutual promotion. The advantages of green buildings in reducing energy consumption, reducing carbon emissions and improving indoor air quality not only help to improve the quality of life of residents, but also minimize the impact on the ecological environment. This paper aims to discuss the relationship between green building and sustainable development of urban economy and its significance to urban development by analyzing the way and ability of green building to save energy and resources.