本文介绍了一种新型压缩机故障在线检测系统。从运行的压缩机壳体拾取的声发射信号中提取特征值，判别压缩机的故障种类。检测系统利用ＡＥ信号进行检测，不受生产现场噪音和振动的影响，有误报率低、可靠性高等优点。该检测系统检测周期短，可用于冰箱、空调等家电用小型压缩生产线的质量检测。 This article describes a new compressor fault on-line detection system. The characteristic value is extracted from the acoustic emission signal picked up by the running compressor casing to determine the type of failure of the compressor. Detection system using AE signal detection, from the production site noise and vibration, low false alarm rate, high reliability. The detection system has a short detection cycle and can be used for the quality inspection of small compression production lines for appliances such as refrigerators and air conditioners.