For H-type Vertical Axis Wind Turbine (VAWT), through Computational Fluid Dynamics (CFD) simulation, the airfoil design is associated with turbine array, and the torque coefficient CM, power coefficient CP and average power parameter Ω of the VAWT under various airfoils and different array conditions are compared and analyzed. The power coefficient of asymmetric airfoil is lower than that of symmetrical airfoil at high tip speed ratio, and the bending effect can significantly improve the power coefficient of the airfoil in downwind region. In the wind farm array, after the optimization of the three-turbine array, the turbine power in the downwind zone can be significantly increased, the single turbine power can be increased by 40%, and the overall wind farm power can be increased by about 20%. Five-turbine array is proposed for the structural plane of the sea pasture. After the optimization, the overall efficiency of the wind farm can be increased by 65%, and the performance of the single turbine can be improved by 100%. The research results are of promotion significance for improving the function and design of far-reaching marine cage system.