As an effective non-destructive testing method, acoustic emission detection technology has been widely used in structural health monitoring (SHM). This paper proposes a wireless monitoring system based on acoustic emission technology. A wireless communication system based on amplitude modulation of acoustic emission signals is designed. Envelope detection is adopted at the receiving end to retrieve the original acoustic emission signal. Compared with the conventional coherent demodulation method, the propose approach avoids the necessity of coherent carrier at the receiver node, which reduces the complexity of the system. The performance of the prototype was verified by a pitch-catch experiment using the piezoelectric transducers, demonstrating its capability for monitoring the acoustic emission signal and potential for the structural health monitoring applications.