[Objective] Aiming at the technical challenge of balancing the accuracy and efficiency of online wideband impedance measurement of wind turbines, this paper proposes a hybrid measurement method that integrates key frequency targeted high-precision injection and wideband impedance transfer reconstruction. [Methods] Firstly, the standard simulation model was constructed based on the target wind turbines to obtain its all-operating-conditions wideband impedance data model. Secondly, the key frequency point set was screened, and the impedance data of the target wind turbines at the key frequency points were obtained online via targeted injection of single-sine signals. Finally, the discrete key frequency point impedance was extended to the target frequency band by employing transfer reconstruction technology, and fast online measurement of wideband impedance characteristics of the wind turbines was realized. [Results] The effectiveness of the proposed hybrid measurement method was verified by simulation and controller hardware-in-the-loop experiments. The experimental results showed that under the influence of 30 dB noise, the measurement accuracy of the proposed hybrid measurement method was comparable to that of the traditional single-sine frequency sweep method, while the measurement time was reduced by more than 85%. [Conclusion] The proposed hybrid measurement method significantly reduces the online measurement frequency points while retaining the high-precision advantages of single-sine signal injection, thus effectively improving the measurement efficiency.