Intelligent piezoelectric wind turbine blade is a new conceptual blade with adaptive vibration attenuation proposed with the large-scaled development of wind turbines. This study explores the vibration attenuation effect and energy dissipation mecha‐ nism of piezoelectric blades. It could provide a theoretical reference for piezoelectric load vibration reduction design for ultra-large offshore wind turbine blades. Moreover， an aeroelastic model design method of equivalent beam section applicable to section-vari‐ able three-dimensional blades is proposed and the piezoelectric vibration attenuation effects of 15 MW wind turbine blades are com‐ pared based on synchronous aeroelastic wind tunnel test of vibration and force. The evolution law of rotate speed and energy distri‐ bution form of electrical-aeroelastic coupling mode are analyzed based on the secondary developed kinetic model of electromechani‐ cal coupling blades. Meanwhile， the dissipation mechanism of energy of piezoelectric blades is disclosed. The research demon‐ strates that the proposed aeroelastic wind tunnel test can reflect the wind-induced vibration attenuation effect of piezoelectric blades. Piezoelectric materials can narrow the interval of sensitive wind angle of wind turbine blades， increase the critical wind speed for frequency-locked vibration significantly and prolong the energy accumulation time of aeroelastic instability. Piezoelectric materials lead to a uniform transfer of wind-induced vibration energy of blades in the modal space， weaken energy accumulation of negative damping modal， and strengthen the energy dissipation of positive damping modal.