Hainan has deepened its policy advantages from special zones, special economic zones, and international tourist islands to free trade zones and then to free trade ports in 2020, laying a favorable foundation for financial activities. This paper explores the financial agglomeration effect of Hainan within the superimposed advantages of a free trade zone and free trade port, utilizing multi-dimensional data such as industrial concentration, Herfindahl index, and spatial Gini coefficient to gauge the extent of financial activity agglomeration in the region. And the Moran’I index is used to verify the existence of the spatial effect of financial activities in Hainan FTTP. Finally, we use empirical analysis to assess the economic growth effects of the financial liberalization policy of the Hainan FTP. The research results show that Hainan FTTP’s financial opening policy has a big positive impact on the region’s economic growth. The closest neighbor index for the whole area of Hainan FTTP is 0.162351, which means that the financial activities in Hainan FTTP are spread out in a way that makes them more concentrated in space. Most cities and counties exhibit a clear financial industry agglomeration, primarily concentrated in government sites. However, the scale of financial industry agglomeration between different cities and counties is uneven. Based on the results, we can summarize the financial activities in Hainan using the superposition advantage of the port area and propose regulatory policy recommendations.