A piezoelectric array energy harvesting system based on imperfect acoustic black holes is proposed to solve the problem of low energy recovery efficiency of high frequency piezoelectric vibration. The thin plate structure model of the imperfect acoustic black hole is established, and the energy accumulation characteristics in time domain and frequency domain are analyzed. The energy of the imperfect acoustic black hole structure is concentrated at several positions of the central platform. The experimental model of the piezoelectric array energy harvesting system is established. The output voltage of the energy gathering point on the central platform of the structure has a large phase difference, which is eliminated by introducing a rectifier circuit. The output voltage of the series and parallel circuits before and after rectification is compared and analyzed. The results show that the output voltage capability of the system has been greatly improved after rectification.