The utility model relates to an electric power tool field specifically is multifunctional cabinet protects device, including insulating casing, and arrange the fastener in the insulating casing in, current detection device, temperature measuring device, a data storage module, communication module, the timing module, display module and pushbutton control module, the fastener is including electrically conductive fastener body, line ball screw and ground structure, data storage module can save current detection and temperature measuring device's detection data and the time data who corresponds, through the fastener with the snap -on of this device on the supply cable, the cable can continue normal use, when needing ground connection, open insulating casing, directly adorn grouding device on the ground structure, realize cable grounding promptly, carry out current surveying and temperature measurement through current detection device and temperature measuring device to surveying the cable,and through data storage module with the electric current, temperature and the time data storage that corresponds, and can be with the data direct indication through the display module, the collection of the data of being convenient for, derive and the analysis.