Marine green development is an important part of marine high-quality development. Adhering to the green development mode of ecological priority and resource sustainability is of great significance for marine sustainable development. On the basis of combing the concept and connotation of marine green development, taking 11 coastal provinces and cities as the research object, based on the panel data of coastal provinces and cities from 2006 to 2017, the evaluation index system of marine green development level was established and the level of marine green development was measured by variable modulus and identification model, then use the ArcGIS software and the Markov space model to analyze its spatiotemporal evolution. Finally, use the panel data model to analyze the influencing factors. The study results show that from 2006 to 2017, the level of marine green development in China has maintained an increasing trend and the overall increase is 19.6%, but the overall is still keep the medium level, and have obviously regional differences. In terms of spatial distribution, the characteristics of spatial agglomeration are still obvious. For example, the overall level of marine green development in southeast coastal areas is relatively high, while the level of marine green development in southwest and northeast areas is relatively low. According to the distribution at provincial scale, the level of marine green development in Shanghai, Tianjin and Shandong is relatively high, and the level of marine green development in Hebei and Guangxi is relatively low. The regional background has a significant impact on the transfer of marine green development types, that is, when regions are surrounded by high-level regions, there is radiated, promoting influence on the growth of marine green development level, and when regions are surrounded by low-level regional, there is constrained influence on the growth of marine green development level. From the perspective of external factors, government regulation, land economy level and open degree have positive and significant impacts on the green development of the ocean, the environmental governance has negative and significant impact on the green development of the ocean, and marine industry structure, marine management and marine resources utilization all have positive and significant influence on the green development of the ocean. According to the above conclusions, the paper puts forward different development approaches and countermeasures for marine green development in different regions, which provides scientific reference for marine green development.