China, the European Union, and the United States are the three largest digital economies in the world. This article compares the antitrust regulation of the digital economy in the three regions after the 2000s. It argues that over time, the antitrust regulation of the digital economy in the three regions tends to converge along three dimensions: growing separation of the antitrust regulation of the digital economy from that of the other economic sectors, convergence of regulatory objectives, and convergence of regulatory methods. In combination with the geopoliticization of the platform economy, this article argues that four factors have contributed to shape such convergence: (1) historical factors, (2) globalization of the digital economy, (3) increasing policy imitation and policy competition among the major digital powers of the world, (4) support from the civil society.