Abstract: A supporting device is used in hair dying so as to avoid polluting the body of the user. The supporting device comprises: a supporting plate having a receiving hole; a lateral side of the receiving hole having a slot; a surface of the supporting plate being a smooth surface; a double face tape being stuck on the smooth surface of the supporting plate; the double face tape being tearable from the supporting plate; and a replacing layer adhered above the double face tape; the replacing layer being made of one of unweave cloth and disposable materials, if the replacing layer being dirt, it can be deserted and updated; the replacing layer having a receiving hole coupled to that of the supporting plate.