Ultraviolet radiation produced by corona discharge can be used as detection signal for corona discharge recognition. Ultravioletimagerisexpensive, anditiswidelyusedinliveinspectionofpowertransmissionanddistribution equipment, but it can’t be used in real-time online monitoring, so it can’t detect potential safety hazards in time. In this paper, acoronadischargemonitoringmethodbasedonultravioletsensorisproposed.Bydesigninganopticallenstocollect ultraviolet signals to suppress external interference, the influence of the operating voltage and monitoring distance of the sensoronthemonitoringresultsofultraviolet pulsecountingisstudied, andthe coronadischargepatternoftheultraviolet imageriscomparedwiththatoftheexperiment.Thecalibrationresultsshowthatthebestdetectioneffectcanbeobtainedby settingthesupplyvoltageoftheultravioletsensorto500V.Thevariationtrendoftheultravioletpulsecountingresultsunder different applied voltage is basically the same as that of the spot area measured by the ultraviolet imager. Therefore, the coronadischargemonitoringmethodbasedontheultravioletpulsecountingproposedinthispapercaneffectivelyreflectthe initiation and development of corona discharge. The research results can provide important reference for the development andverificationofon-linemonitoringequipmentfortransmissionanddistributionequipment.