Under the background of "dual carbon" and "marine power" strategy, China developed rapidly in the development and construction of marine economy. However, high-quality development of marine economy was seriously restricted by the contradictions of sea use and the rising operation cost. Based on the development status, technical bottleneck and collaborative development of offshore wind power and marine ranch, the technical dificulties in project planning and site selection, selection of wind power foundations and marine treasures, development of supporting facilities and other aspects were analyzed. Several suggestions were put forward based on engineering examples. The analysis showed that the site selection of cooperative development projects at this stage should be dominated by offshore wind turbines and supplemented by marine ranch, giving full play to their commonality in the use of marine areas. The existing, construction technologies of ofshore wind power and marine ranch were used to improve comprehensive benefits.