In order to achieve fast and accurate acoustic power measurement of the focused sound field, a novel acoustic power measurement method based on PVDF pyroelectric sensor is proposed in this study. Firstly, a finite element model is established based on the acoustic power measurement principle of pyroelectric sensor. The simulation analysis is conducted on the influencing factors of acoustic power measurement. Then, a test system with PVDF pyroelectric sensor is established to carry out the study of the acoustic power measurement method. The results show that the proposed measurement method could be applied in both the acoustic field focal region and nonacoustic field focal region, and the output signal and radiation acoustic power show a linear relationship. The maximum measurement error is 82%, which is in accordance with the acoustic metrological requirement. The comparison analysis results of simulation and experiment verify the reliability and accuracy of the proposed method.