The contribution of small and micro green spaces to urban renewal and the enhancement of urban vitality is very significant. The analysis and summary of the research status and progress of small and micro green spaces will help to construct the long-term mechanism and management mechanism in the future urban renewal. Based on the bibliometric analysis method, this paper selects the CiteSpace knowledge graph analysis tool to carry out visual knowledge graph analysis on the research on urban small and micro green space in English literature in the past 20 years and makes a comprehensive analysis in terms of the number of publications, countries of publishing institutions, keywords co-occurrence, keyword time graph, and keyword frequency. The research focus, evolution and trend of this field are summarized: (1) The research on urban small and micro green space shows a slow increase in the early days and a growing trend in recent years, while foreign research started relatively early; (2) From the perspective of publishing institutions and cooperation, there are many research institutions at home and abroad that pay attention to small and micro green Spaces, but the network relationship of in-depth cooperation between these institutions has not yet formed, and cross-institutional, cross-regional and cross-disciplinary cooperation needs to be further strengthened; (3) In the past 20 years, the research hotspots of small and micro green Spaces at home and abroad mainly focus on knowledge clusters from three different perspectives: “urban renewal”, “landscape equity” and “ecological value”; (4) The research trend shows three evolution processes: “research exploration and theoretical construction”, “research expansion and multiple applications”, and “research deepening and policy feedback”. English research has entered the mature stage, while Chinese research is still in the late stage of application. Finally, the outlook of urban micro green space is made in five aspects, namely, theoretical research, construction guidelines, technical exploration, planning practice, and effect evaluation, with a view to providing references for the further deepening of research and practice of urban micro green space in China.