Abstract: The 21st century is the century of the ocean, which is a strategic location for high-quality development. Major maritime powers around the world have successively formulated ocean development strategies, attempting to seek greater and more benefits from the ocean. The future competition in the field of ocean ecology lies in the ocean. Marx and Engels, in the process of studying the laws of capitalist development, paid attention to the irreplaceable role played by the ocean. The pursuit of marine ecology is the harmony of the relationship between humans and the ocean. The development of Marx and Engels’ view of marine ecology has clear logical clues and evolutionary trends. Its theoretical implications are mainly reflected in the fact that the ocean is a shared avenue for all countries, and the strength of maritime power is related to the fate of the country. The marine economy promotes the development of capitalism, and maritime transportation runs through it. Marx and Engels’ views on marine ecology have important practical implications for protecting marine ecology, promoting harmonious coexistence among people, promoting green economic development, assisting in the construction of a maritime power, and coordinating global ocean governance to build a community with a shared future for the ocean.