The invention discloses a wire and cable high-temperature warning sticker which comprises a first shell. A glass plate is fixed in the middle of the side wall face of the first shell, a color comparison bar is fixed on the outer side of the side wall face of the first shell, the upper-end edge of the first shell is hinged to that of a second shell, one faces, close to each other, of the first shell and the second shell are provided with side wall faces, a sealing layer is fixed on a side face, close to the first shell, of the second shell, and buckles are fixed at the lower ends of the first shell and the second shell. The problem of detecting wire and cable temperature is solved by utilizing a reversible temperature-sensitive sticker, and the wire and cable high-temperature warning sticker is low in cost, convenient to use and easy in popularization; by arranging an elastic sticker fixing device, the device is ensured to be capable of being mounted on wires or cables different in size, and contact area between the sticker and the wires or the cables can be increased through stretching; the sticker can be taken down from the sticker fixing device easily, so that convenience is brought to replacement during maintenance.