Land-sea integration is a new concept derived from the concepts of “land sea coordination”. It is a strategic guiding ideology for China to handle the relationship between ocean and land development, and is of great significance for promoting coordinated development between land and sea. As the closest super large city to the deep waters of the South China Sea in China, Shenzhen has not yet been able to effectively transform its location advantages and land technology industry advantages into advantages for the development of the marine economy, compared to its strong foundation in land warfare and technological innovation. The marine economy faces problems such as small total volume and emerging industry scale, low degree of integration of the sea land industrial chain and uncoordinated development. Starting from the core connotation of land sea integration, the current situation and existing problems of Shenzhen’s land sea economic integration development, and the strategy integrated development of land-sea economy were deeply analyzed.