Economic diplomacy, in terms of the importance of economic relations in foreign relations, is one of the important tools to advance the long-term goals of economic growth and development and even increase the security of countries. Recently, Afghanistan, India and Iran have reached an agreement called the Chabahar Agreement. Due to its location, this port has the appropriate geopolitical, geo-economic and geostrategic potentials in comparison with the ports of the countries in the region and has a very high security margin; in addition, the port at the intersection of the North-South and East-West corridors can serve as a gateway for transportation, in other words, a central trade link between Central Asia, India, Pakistan, Afghanistan, Russia and Europe. In this research we want to answer this question: What impact can economic diplomacy have on post-Taliban developments in Afghanistan? And what is the position of Chabahar port in that country's economic diplomacy? The findings of this descriptive-analytical library research show that: Economic diplomacy in the post-Taliban era by adopting programs such as; attracting foreign investment and expanding relations with the countries of the region and constructive interaction with them, has been able to have positive effects on development in Afghanistan; And the port of Chabahar, as a field for attracting foreign investment on the one hand and its role in xpanding Afghanistan's relations with countries in the region on the other, has found a special place in the country's foreign policy.