At present, the world is facing increasingly severe environmental problems, and green finance is one of the important means to control environmental pollution. China proposes to realize "three to one, one to reduce, one to compensate" and give the economy a position to transform from high-speed growth to high-quality development, so that the understanding of the "green" development concept is continuously deepened in all sectors of society. The financial sector is an important pillar of modern economic development, and giving full play to its functions can effectively promote the development of China's green economy. Therefore, the traditional financial operating model must shift to green, environmentally friendly and sustainable finance. This article focuses on the obstacles to the implementation of environmental protection financial policies in China. This article is aimed at the Beihai Branch of the State Oceanic Administration as an experimental object. From this experiment, we can see that the sewage charges in 2013 were 6.740 billion Yuan, and in 2019, the sewage charges were 18.524 billion Yuan, an increase of nearly twice in absolute amount and an average growth rate of 18.71%. Through this experimental data analysis, the role of current financial support in the development of marine economy has long been valued by major coastal countries in the world. Based on the evaluation of the financial effects of China's marine environmental protection, explore solutions to improve the quality of the marine environment, enhance the carrying capacity of the marine environment, and promote the development of the marine financial industry; from the perspective of policy mix, construct regional capital flows for the coordinated development of the marine environment industry structure to promote the coordinated development of the marine environmental protection industry and marine finance industry. Effectively dock the government's systemic leading role and the market's resource allocation function; organically integrate fiscal and financial mechanisms.