The development of offshore wind power has attracted much attention due to its large reserves and renewable characteristics. In recent years, offshore wind power has been continuously developing towards large-scale development. Factors such as the large volume, heavy weight, and harsh installation environment of wind turbines have made offshore wind turbine installation more difficult. In order to solve the critical problem of quick alignment and pre connection between the wind turbine tower and the wind turbine foundation during the installation of offshore floating wind turbines, a positioning connection device has been designed. And combined with the dynamic response of the floating platform obtained from hydrodynamic analysis, as well as the wind load on the wind turbine nacelle and tower during installation, establish a finite element model for the installation of the floating fan, and perform strength verification on the designed positioning connection device. The results indicate that the designed positioning connection device meets the structural strength requirements and can be applied to the rapid connection between offshore floating wind turbines and foundations.