A gas-sensing tattoo sticker includes an adhesive layer, a coloring reaction layer, and a chemical reaction layer, disposed by stacking. The chemical reaction layer includes reaction zones capable of reacting with a gas to be tested to produce a chemical change； the coloring reaction layer includes coloring sides and correspondingly disposed reaction sides in contact with the reaction zones, and includes a coloring indicator to produce a coloring reaction corresponding to the chemical change of the reaction sides； to and the adhesive layer is provided on a side of the coloring reaction layer or the chemical reaction layer to provide adhesion, thereby completing the gas-sensing tattoo sticker, changes of gas in the surrounding environment can be sensed when air inlet sides are outwardly adhered on an object； and the smell of an object itself can be sensed when the air inlet sides are inwardly adhered on the object.
