During its historical life, the Caspian Sea has always been a safe place for many races, people, and governments. Unfortunately, humanity does not appreciate this valuable water zone and steps away consciously or unknowingly on the path to its destruction and demolition. Taking the path in this way is equal to obliterating the roots of the present generation and future generations. With the aim of evaluating the environmental security structure of the Caspian Sea, this research examines a new legal framework for this water zone. Moreover, the research also argued that the Caspian requires effective political and legal decision-making to achieve its ideal state both environmentally and economically or socially. Until the collapse of the Soviet Union in 1991, the Caspian Sea was dominated by the two governments of Iran and the Soviet Union. The intense asymmetry between power and resources between the two countries led to the unofficial and actual control of the region in the hands of the Soviet Union.