The invention relates to a device capable of detecting electric-leakage signals timely, in particular to an electric-leakage monitoring device. The electric-leakage monitoring device comprises a main control module, an electric-leakage detecting module, an analog electric-leakage module, an alarm module, a display module and a power module. The main control module is connected with the electric-leakage detecting module, the analog electric-leakage module, the alarm module and the display module respectively, and the power module powers the entire device. The electric-leakage monitoring device is applicable to electric power departments.