Abstract: The effective development of marine carbon sink can provide strong support for the realization of the carbon neutral goal. To increase the enthusiasm of stakeholders to participate in the development of marine carbon sink and promote the full realization of the dual ecological and economic value of marine carbon sink, this paper selects the five coastal cities in Zhejiang province, constructs system dynamics model of marine carbon sink bank-marine resources and environment-regional economy-social development, simulates and analyzes the impact of establishment of marine carbon sink bank on the marine resources, environment and economic and social development of the five cities. The results show that: (1) the establishment of marine carbon sink bank has a significant promotion effect on the restoration of coastal wetland area, compared to the no-established carbon sink bank scenario, under the scenario of establishing a marine carbon sink bank, the area of coastal wetland increases at a relatively fast speed; (2) after the establishment of marine carbon sink bank, the marine resources and the environment are even better, different from the no marine carbon sink bank scenario; (3) marine carbon sink banks have a strong contribution to economic growth, in particular, starting from the year 20 of the simulation period, marine carbon sink bank earnings began to grow rapidly.Therefore, marine carbon sink banks have significant economic and ecological effects. In order to better develop marine carbon sink banks, the following suggestions are proposed: (1) establish a transaction management system; (2) implement adaptive governance; (3) enhance the technical support level for the development of marine carbon sink resources.