Abstract: Corrosion affects the dynamic response characteristics of offshore wind turbines. In order to evaluate and predict the dynamic mechanical behavior and fatigue life of multi-corrosion aged offshore wind turbines, the parametric mathematical model of corrosionfloating wind turbines was established based on Lagrange equation and homogeneous corrosion model to analyze the dynamic response characteristics of multi-corrosion-aged offshore wind turbines. The results show that with the accumulation of corrosion age, the amplitude of bending frequency response becomes the main factor affecting the displacement movement of the tower top, the bending stress of the tower increases exponentially, and the fatigue life of the tower decreases sharply.