Platform economy is a new business model connecting multiple user groups to exchange information and resources. In recent years, its monopoly situation has become increasingly fierce, which poses new challenges to the existing regulatory model and anti-monopoly research theory. Citespace V is used to visualize the knowledge map of the anti-monopoly research on platform economy of CSSCI source journals in the CNKI database from 2003 to 2022. Based on exploring the evolution path of research hotspots in this field, the theoretical framework of anti-monopoly on platform economy is constructed. It is found that the topic of platform economy anti-monopoly research has undergone four stages of evolution, from traditional bilateral industry anti-monopoly and anti-monopoly law construction, to bilateral market characteristics and related market definition issues, to monopoly governance dilemma caused by algorithms and big data, and then to the formation of super platform and "two or one" exclusive transaction agreement. Generally speaking, the theoretical framework of platform economy anti-monopoly is composed of three parts: monopoly formation mechanism, monopoly evolution trend and anti-monopoly regulation system. The scale effect, network effect and lock-in effect of platform economy lead to the occurrence of monopoly. Monopolistic competition theory, bilateral market theory and industrial organization theory are the important research perspectives of this problem. Driven by technology and scale, platform economy presents the main change of "manufacturer monopoly -- platform monopoly -- field monopoly" and the upgrade of "price monopoly -- algorithm monopoly -- data monopoly". Therefore, a comprehensive regulation system combining price regulation, algorithmic regulation and data governance should be constructed.