Dark tea is one of the most popular types of tea, in order to sort out the research process of dark tea, this paper using CiteSpace visualization analysis software, based on China National Knowledge Infrastructure (CNKI) database and Web of Science (WOS) database, 3436 Chinese and 617 English literatures were screened and analyzed by visualizing the information of authors, keywords, research institutions, countries and published journals. It is found that the number of dark tea literature is increasing, which is now in the stage of rapid development. The Chinese researches are earlier than English researches. Tea in Fujian and Journal of Agricultural and Food Chemistry were the Chinese and English journals with the highest publication volume of dark tea. The study of dark tea forms a number of research groups represented by scholars, scholar representatives included LIU Zhonghua, LÜ Caiyou and ZHOU Hongjie, etc. The research institutions are mainly agricultural colleges and tea research institutes, and the institutions with more in-depth research results are Yunnan Agricultural University, Hunan Agricultural University and Anhui Agricultural University. China is the most influential Country in dark tea research, followed by The United States of America and Japan. Chinese literature focused on the mechanism of dark tea quality formation, microorganisms, aroma composition, while English literature pays more attention to the pharmacological research, and the research of dark tea's intervention efficacy on metabolic diseases such as diabetes, atherosclerosis is still the a hotspot of dark tea research in the future.
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