The acoustic emission sensors are widely employed in the partial discharge detection, but those based on PZT piezoelectric ceramics are difficult to meet the increasing demands for sensitivity and bandwidth simultaneously. This study designs a dual-resonance acoustic emission sensor using high-performance ferroelectric single crystal PMN-PT as the piezoelectric vibrator. The resonant peak coupling is used to improve the sensitivity and bandwidth simultaneously. The fabricated sensor demonstrates a remarkable sensitivity of 76.2 dB, along with a wide bandwidth of 20 kHz to 105 kHz. It exhibits excellent stability, surpassing PZT-5H-based acoustic emission sensors in sensitivity and signal-to-noise ratio.