With the development and popularization of the Internet, research on Internet public opinion has attracted increasing attention. Based on CNKI database, this paper uses the keyword clustering function of Citespace software to review the main topics of online public opinion research in China since 2005. After the keyword data having been classified into offline behavior, information data and public opinion opinions, domestic works of online public opinion research are chronologically classified into five stages: the beginning stage, the emerging stage, the developing stage, the plateau stage and the turning stage. Further discussion of their respective characteristics is made to provide inspiration for future research.