The blue and green spaces in cities have similar natural attributes, especially regarding ecological values, which are closely related and interact. They are essential research objects of human settlements. In the past urban construction, green and blue spaces formed a separate system, restricting the overall function and value of blue and green spaces. Under the background of park city construction and high-quality urban development, “blue-green integration development” has become an important topic to explore a new sustainable urban development model. Based on clarifying the concepts of urban green space, blue space, and blue-green space, this paper used the bibliometric analysis method and CiteSpace software to conduct quantitative analysis, qualitative induction, and comparison of the changes in the number of Chinese and English documents issued, the main research directions and the migration of research hotspots between 2000 and 2021 and combs the development of the ecological values of blue-green space. The research progress of 3 hotspots, namely, stormwater management, cooling effect, and carbon sequestration, are discussed. The results show that the research on urban blue-green space started late, but the research on urban green and blue space provides a basis for it. In recent years, research has gradually shifted from unilateral urban green and blue spaces to studying the overall ecological values of blue-green spaces. In the future, further analysis can be carried out on the synergy mechanism of environmental values of blue-green space, the construction of a coupling evaluation system, and environmental performance evaluation, and in-depth exploration can be carried out in combination with practice in blue-green space planning methods, quantitative analysis and assessment techniques, and blue-green space integration models.