介绍了冷轧铝带厚度自动检测及控制的基本原理，给出了硬件和软件设计，分析了检测及控制精度。该系统具有高精度、高稳定性的特点，已成功应用于冷轧超薄铝带的生产过程，收到了良好的经济效益。 The basic principle of the automatic detection and control of the thickness of cold rolled aluminum strip is introduced. The hardware and software design are given, and the precision of detection and control is analyzed. The system has the characteristics of high precision and high stability. It has been successfully applied in the production of cold-rolled ultra-thin aluminum strip and has received good economic benefits.