To face with global warming, countries around the world are converting electric vehicles at an accelerated rate. Among the automotive industry in the transition period of electric vehicles, China has emerged as a leader in electric vehicles, and its competitiveness has increased significantly. In this study, the international competitiveness of the electric vehicle industry in China, the United States, and South Korea will be analyzed in comparison. For this purpose, the diamond model was used to analyze the data of Korea, China, and the United States from 2017 to 2021. The main analysis results are as follows. China has a high international competitiveness in terms of factor conditions, demand conditions, and related and supporting industries. This is due to China's absolute population size and the resulting market size and market growth potential, especially as a result of the Chinese government's early support of subsidies to strategically nurture the electric vehicle industry, build infrastructure, and popularize electric vehicles in the early stages. The U.S. has significantly higher advantages in firm strategy,structure and rivalry. Slightly lower factor conditions and demand conditions than China, and particularly lower competitiveness in related and supporting industries. The U.S. has particularly low competitiveness in related and supporting industries because of the core strengths that have failed to respond pre-emptively to the changes following the switch to electric vehicles. Korea has low international competitiveness in all fields after converting to electric vehicles. This is mainly the result of limited resources and failure to achieve competitiveness of the industry through technological innovation when the factor conditions and demand conditions are at absolute disadvantage. The example of electric vehicles in China shows that in a technology-intensive, highly connected industry, the innovative R&D capabilities of companies are important to ensure international competitiveness, but the most important thing is the government's strategic industrial fostering policies.