City cable run ground connection circulation on -line monitoring device belongs to cable online monitoring technology field, especially relates to a city cable run ground connection circulation on -line monitoring device. The utility model provides an efficient, power supply makes things convenient for, job stabilization's city cable run ground connection circulation on -line monitoring device. The utility model discloses an electric current collection module, signal analysis calculation module, wireless communication module and power module, its structural feature cable earth current signal is connected with electric current collection module, electric current collection module and signal analysis calculation module are connected, signal analysis calculation module and wireless communication module are connected, power module is electric current collection module, signal analysis calculation module, wireless communication module power supply, electric current collection module includes A phase electric current acquisition circuit, B phase electric current acquisition circuit, C phase electric current acquisition circuit, N phase electric current acquisition circuit and adc.