The invention relates to a doped gas generation device for supplying reaction gas to an ion mobility spectrometer. The doped gas generation device comprises a doping pot, a gas inlet pipe, a gas outlet pipe, a doped gas generation unit and a heating temperature control device, wherein the inlet end of the gas inlet pipe is connected with the upstream side of a gas carrying path, and the outlet end of the gas inlet pipe is connected with the doping pot; the inlet end of the gas outlet pipe is connected with the doping pot, and the outlet end of the gas outlet pipe is connected with the downstream side of the gas carrying path; and the doped gas generation unit is used for releasing dopant gas, and is arranged in the doping pot. The doped gas generation unit for releasing the dopant gas is arranged in the doping pot, so that the doped gas can be used for solid dopant and liquid dopant.