The utility model discloses an intelligent ultrasonic wave local discharge on -line monitoring system, including vehicle bodywork, monitoring track, ultrasonic wave partial discharge detector host computer, server and display terminal, vehicle bodywork and monitoring track joint, just the bottom surface of one side of vehicle bodywork is provided with ultrasonic transducer, and the top is provided with wireless transmission antenna, inside singlechip, motor, digital analog conversion module, wireless data transmission module and the power module of being provided with of vehicle bodywork. The utility model discloses the system installs the track route through GIS jar body surface face in the transformer substation, and directional motion's ultrasonic transducer can be in the use on the track, and reliable stable monitoring is carried out to GIS's state to proper motion for a long time. The real -time data of gathering of ultrasonic transducer are spreaded into into main monitor backend server through communication cable in this system, and the server has the automatic alarm function simultaneously, can report to the police after the probe detects abnormal signal and remind the staff to carry out further detection.