The construction of pocket parks will help improve the environmental quality of high-density urban areas, improve the uneven distribution of park green space, increase the per capita park green area in the city, and provide more opportunities for urban residents to enjoy green space resources moderately. Taking the pocket park construction in Minhang District, Shanghai as an example, GPS is used to locate the existing urban park green space, and the traffic connection and POI big data are combined with the traditional yearbook statistical data to introduce the fairness of the park green space configuration: reachability analysis and supply and demand balance analysis. By comparing the accessibility of pocket parks, the ratio of the number of walking service areas and the population ratio of walking services in parks, the spatial layout and supply-demand relationship of pocket parks in Minhang District are analyzed from the perspective of social equity. The research results show that through the construction of pocket parks, the accessibility coverage of green park spaces in the central and southern parts of Minhang District is relatively high. The supply and demand are fairly balanced, but the accessibility and supply demand balance of green park spaces in the western, northern, and eastern regions still need to be improved. It is necessary to increase the layout of pocket parks and improve the supply capacity of park green space. Finally, suggestions for the future construction of pocket parks in Minhang District are put forward from three aspects: optimization of planning layout, precise filling of blind spots, and increasing social participation. To provide the theoretical and practical basis and new ideas for the high-quality construction of pocket parks in Shanghai.