To enhance the precision and efficiency of designing and simulating floating wind turbine systems, this paper presents the design and implementation of an electromechanical co-simulation experimental system for floating offshore wind turbines. The system employs OpenFAST software to create a detailed mechanical model of the floating wind turbine, simulating its dynamic behavior within the complex ocean environment. Subsequently, it utilizes Simulink software to construct the electrical model of the doubly-fed induction generator and its corresponding controller, achieving the co-simulation of the mechanical and electrical models. Considering the aerodynamic force, hydrodynamic force, dynamic response of mechanical structure, working condition of generator and control strategy of electrical system, the high-fidelity simulation of wind power system is realized. In order to enhance the intuitiveness and interactivity of the simulation results, the ParaView software is used to realize the 3D visualization of the simulation results. The results show that the electromechanical co-simulation can be closer to the actual situation, and the visualization platform provides a more intuitive reflection of wind turbine movements.