Under the influence of economic globalization, the relationship between finance and trade has become increasingly close, and the influence of each other has been further strengthened. Financial development will affect the development level of international trade, and the development level of international trade will also affect financial development. This paper expounds the relationship between financial development and international trade, and increases the understanding of theoretical definitions. Secondly, analyze the relationship between financial development and international trade. Thirdly, it discusses the mutual influence of financial development and international trade, and constructs the influence mechanism of financial development and international trade from two aspects. Finally, the optimization countermeasures of the interaction mechanism between financial development and international trade are proposed.