Urban green space has been widely concerned by people from all walks of life because of its potential benefits for the physical and mental health of the urban population. Green space has economic, ecological and social functions. Its ecological function is that green space can absorb urban air pollutants, improve air quality, and improve the living environment; social function is reflected in the urban green space provides a place for relaxation and leisure, ease the mental pressure of residents, reduce the risk of public illness, promote physical and mental health. Therefore, it is of great significance to public well‐being and sustainable urban development. This article summarizes the commonly used estimation methods and data sources of green space accessibility, combs the relationship between urban green space accessibility, residents' physical and mental health and social equity, and prospects for future research directions: enrich more research on the types of green space and add more research on public welfare.