The utility model discloses an electrified rand of warning of cable, including the rand body and connecting the compression frame in rand body one end, compression frame surface is provided with the through -hole, and the through -hole that the compression was put up passes through the bayonet lock to be connected, and the both ends of rand body are connected with a receiving line way and the 2nd receiving line way respectively, and the both ends on a receiving line way and the 2nd receiving line way are connected with voltage detector respectively, and the surface of rand body is provided with the display, and voltage detector is connected through a receiving line way and the 2nd receiving line way to the display, this kind of electrified rand of warning of cable connects voltage detector respectively on the cable conductor of rand both sides, when voltage stabilization, can show on the display that the pilot lamp of switching on simultaneously lights, makes user or guardian know the very first time, the in service behavior of cable, and when the circuit was unstable, the display can show unstable sign this moment, warning light scintillation simultaneously can be warned user and guardian, prevents electric power leakage or cable fault.