Ion mobility spectrometer

The invention relates to an ion mobility spectrometer comprising an ion mobility spectrometer and a hollow closed thermostat. The ion mobility spectrometer is arranged in the thermostat. The sample introduction port of the ion mobility spectrometer passes through the outer wall of the thermostat and is communicated with the outside. The ion mobility tube of the ion mobility spectrometer is provided with an electric heating device for realizing the working of the ion mobility tube in the constant temperature condition. The thermostat is used to realize the working environment constant temperature of the ion mobility spectrometer. Thus, the ion mobility spectrometer can be used to effectively solve the influences of temperature on ion mobility and other components of the ion mobility spectrometer to make the ion mobility spectrometer adapt to a wider temperature range.