Cross-border e-commerce is a new type of international trade development method. The government's policies on cross-border e-commerce have importantly played an strategic support role for the development of cross-border e-commerce. This article will take the policy documents related to cross-border e-commerce policies issued by the Central Committee of the Communist Party of China, the State Council and relevant ministries and commissions from 2019 to 2021 as the object. Carrying out relevant content analysis and analyzing the effectiveness of policy tools, the research has drawn the following results: In terms of cross-border e-commerce, the government mostly adopts environmental policy tools for regulation, and the proportion of supply-based policy tools is moderate, and there is a lack of demand-based policy tools; the main body of the government tends to adopt weak normative policies. Therefore, in response to the existing problems, this article proposes that the internal structure of policies should be optimized and the proportion of different types of policy tools should be balanced; the system of policies should be strengthened to form a stable and effective government supervision system; the interaction of multi-dimensional policies should be formed to make up for shortcomings and maximize the effectiveness of the policy.