Abstract: A FPGA-based acoustic emission detector was designed to detect acoustic signal brought about by the material deformation and fracture.Firstly,the detection signal from the sensor was amplified and gain was adjusted;Then analog to digital conversion for the modulated analog signal was implemented by 14 bit AD9226;When sampled value is greater than the set threshold,an acoustic emission event shall be triggered and data of 4-channel are acquired and stored in SDRAM;When an acoustic emission event is ended,the data will be transferred to the host computer by wireless communication,and then be analyzed,processed,displayed,and so on.