The invention discloses a test method of a banned azo-dye in cigarette paper and belongs to the technical field of physical and chemical inspection of harmful substance residues in lined paper, tipping paper and carton packaging paper for cigarettes. The test method is characterized by comprising the following steps: cutting a cigarette paper sample, adding a reduction solution, reducing an azo substance into aromatic amine by sodium hydrosulfite in a citric acid buffer solution, extracting aromatic amine from the solution by a liquid-liquid extraction method, concentrating, redissolving by methanol, testing by a liquid chromatography-tandem mass spectrometry combined instrument, and quantifying by an internal standard method. According to the method, the deficiencies of a sample treatment method in the prior art are overcome, and a sample pre-treatment method and instrument test conditions are optimized for the tipping paper, the lined paper and the carton packaging paper for the cigarettes; as a solid-phase extraction column does not need to be passed, cumbersome purification and concentration steps such as rotary evaporation are not required, and the method has the advantages of accuracy for operation, high recovery rate, quickness, simplicity, convenience, high sensitivity and the like.