The invention provides a method and a device for off-line analysis of products generated by simulated combustion of cigarettes. The method comprises the following steps of: putting a cigarette sample in a thermogravimetric analyzer for programmable temperature rise cracking under a condition of inert gas or synthetic air; conforming the thermal cracking with the actual combustion process of the cigarette sample by adjusting compositions and a flow rate of carrier gas; and allowing cracking products to be carried by a gas into a catching adsorption tube and undergo CG/MS analysis after the thermal desorption of the adsorption tube. The he device comprises a gas flowmeter, a thermogravimetric analyzer, a catching adsorption tube, a thermal desorption device and a GC/MS gas chromatography-mass spectrometry, wherein the gas inlet of the gas flowmeter is connected with a nitrogen source and an oxygen source by tubes respectively; the gas outlet of the gas flowmeter is connected with the thermogravimetric analyzer provided with a connecting tube opening connected with the catching adsorption tube, the inside of the thermal desorption device is provided with a working position on which the catching adsorption tube is arranged, and the thermal desorption device can be connected with the GC/MS gas chromatography-mass spectrometry by the controllable temperature transmission line.