At the era of the iterative development of the digital economy，the traditional antitrust legal system has been lagging，rigid and inefficient. For this reason，it has become a trend for antitrust legislation，enforcement，and judicial authorities in the United States，the European Union，and China to optimize and strengthen the legal regulation mechanisms in the digital economy. Specifically，U.S. law enforcement agencies frequently initiate antitrust regulatory measures against mega digital platform enterprises. At the same time，the U.S. legislature has also started revamping the U.S. antitrust legal system. The EU has started to set up a new legal system of market regulation，represented by the Digital Market Act. In the context of this era，Chinese public authorities should follow the current development status of the Internet economy in their own country and draw lessons from the digital economy governance experience of the U.S. and the EU in an orderly manner. In this way，the digital reform process of the legal system of market supervision should be initiated at the legislative，law enforcement，and judicial levels. Ultimately，Chinese public authorities should build a new legal system for China’s platform economy governance that is compatible with anti-monopoly law，anti-unfair competition law，personal information protection law，network security law，data security law and other laws.