Abstract: At present, most of the devices used for abnormal discharge detection are ultraviolet imaging instruments, which have high cost, poor portability and single applicability in the working environment. The way of handheld camera is not suitable for the power distribution equipment detection environment with narrow space and dim light, and there is a visual blind spot. Develop a set of efficient and low-cost abnormal discharge signal detection device. The ultraviolet light generated in the discharge process is detected by the ultraviolet probe. Through light conduction technology, spectral analysis technology, photoelectric conversion technology and digital conversion transmission technology, the optical signal collected by the sensor is photoelectrically converted into electrical signal, and then the abnormal discharge signal is sorted out after spectral analysis and digital conversion, so as to achieve the purpose of abnormal discharge detection. Overcome the problems of high cost and low applicability, and improve the safety, accuracy and rapidity of detection.