The utility model discloses a platform for measuring gaseous product components and coal sample mass loss in a coal oxidation process. The device comprises a gas inlet mechanism, a composite reactionmechanism, a quantitative gas taking mechanism and a chromatographic analyzer which are connected in sequence, the quantitative gas taking mechanism comprises a motor module, and a first connecting pipe and a second connecting pipe which are symmetrically fixed on two sides of a motor rotating shaft of the motor module; one end of the first connecting pipe or one end of the second connecting pipeis communicated with the gas output pipeline, a first electromagnetic valve and a second electromagnetic valve are installed on the first connecting pipe, and a third electromagnetic valve and a fourth electromagnetic valve are installed on the second connecting pipe. According to the utility model, various experimental gases are fully mixed; the experimental gas and coal oxygen accurate reactionwith various high requirements is met, the system error is small, the quantitative gas taking mechanism is used for obtaining the gaseous product components of the coal oxygen composite reaction in each stage, and the temperature, weight and gas components representing the nature of the relatively slow chemical reaction process are reliably extracted and comprehensively measured.