The utility model discloses a device for detecting a flashover fault of a circuit, and the device comprises a data collection unit, a data processing unit which is connected with the data collection unit, a data transmission unit which is connected with the data processing unit, a data analysis unit which is connected with the data transmission unit, and a data output unit which is connected with the data analysis unit. The device provided by the utility model can measure the flashover caused by windage yaw and insulator flashover at the same time. Compared with a conventional mode of measurement, a half of operation devices are reduced. Moreover, a system based on noise signal detection is simple in structure, the cost of the operation and maintenance of devices is low, and the work efficiency of maintenance workers can be greatly improved.