In recent years, the number of coastal wind power farms and wind power structures is growing up rapidly. However, the coastal wind power structures are always damaged by typhoon. This paper employs a typhoon fluctuating wind power spectrum which does not change with height, the linear filtering method and a simplified expression based on the vertical correlation to simulate the typhoon wind field model of a coastal wind farm. The power spectral density function is adopted to verify the accuracy of the simulated wind field. Wind power structure- pile foundation structure coupling finite element model is set up, and the wind power structure dynamic response under the lower limit and upper limit speed of typhoon is calculated, in order to analysis the possible failure modes of the main structure under extreme wind. The results show that the yield region mainly located in the bottom of the tower drum about 4m height within the scope of a cone-shaped distribution. The joint of the tower drum bottom and the embedded ring is the most unfavorable position. The tower horizontal displacement exceeds the permissible value under the upper limit speed of typhoon, but the most unfavorable single pile axial force are not beyond the limit in neither situations. This work lays an important foundation for the further research on nonlinear collapse of wind power structure under the extreme wind situation.