The invention relates to the technical field of piezosurgery dynamic impedance feedback, and discloses a piezosurgery dynamic impedance feedback method, the specific circuit comprises a main power supply, an HMI human-computer interaction module, an MCU, a numerical control excitation power supply, a matching circuit consisting of a matching inductor and a matching capacitor, a sampling circuit composed of a resistance-capacitance voltage division circuit and a Hall sensor, a gain amplification circuit, a band-pass filter circuit, a level adjustment circuit, an in-amplitude phase detection andlow-pass filter circuit and a RMS true virtual value circuit. The resistance-capacitance circuit is adopted to divide voltage and sample the Hall sensor, so that the interference of the sampled original signal is reduced, no extra component is connected in series into the matching circuit, the acquired original signal is more accurate, the signal precision of the signal processing circuit is ensured, the drift error is reduced, the band-pass filter circuit is introduced, and the final signal is more accurate and cleaner, the corrected resonant frequency is calculated by adopting an error PIDalgorithm, and the frequency tracking speed is higher.