Abstract: China urgently needs to realize the value of blue carbon sink of coastal wetlands through the carbon sink trading, so as to solve the problem of lack of endogenous incentive mechanism in the field of coastal wetlands conservation and restoration. Therefore, this paper puts forward the analytical framework of the value realization of blue carbon sink of coastal wetlands through carbon sink trading. It also analyzes the current status of blue carbon sink trading of coastal wetlands at home and abroad and summarizes the problems of China. Besides, this article explores the mechanism and path of the value realization of blue carbon sink of coastal wetlands in China from perspective of blue carbon trading. The results show that: first of all, China's blue carbon sink trading still exist problems of imperfect policies and laws, unclear property rights of blue carbon sink, inconsistent accounting standards system, imperfect market trading mechanisms and multiple trading risks. Secondly, this paper analyzes the mechanism of the value realization of blue carbon sink of coastal wetlands in China from the perspective of the identification of trading object and subject, value accounting, market establishment and effectiveness analysis. Thirdly, this paper recommends the following suggestions: improve legal and policy system, clarify the property right of blue carbon sink, establish uniform accounting standard system, promote multiple subjects to participate in trading, define scientific price of blue carbon sink, standardize the market order and strengthen financial support.