Objective: In this paper, we use Citespace 5.5 information visualization software as the analysis software, and collect the analysis of the discourse identity construction from CNKI database of China Knowledge Network. This paper explores the current situation and hotspots of discourse identity construction research in China since its emergence and clarifies the development of the past 20 years. The results show that: the overall trend of discourse identity construction has been increasing year by year; there are fewer collaborative relationships between major researchers and research institutions; research topics are broad, covering education, politics, business, law, medical gender, etc.; research theories are dominated by critical discourse analysis and pragmatics; and research methods have gradually developed to combine qualitative and quantitative approaches. Finally, the article outlooks the development trend of discourse identity construction, and believes that in the future: (1) it can be studied from an ecological perspective, and a theory and framework of identity construction research in line with green and harmonious can be formulated. (2) the integration between identity construction and various theories and disciplines can be promoted more deeply, and the application of natural sciences should be paid attention to in addition to the application of humanities and social sciences related fields, so as to realize the development of supra-discipline at an early date.