Device and method for detecting helium content in natural gas and related application of device and method

The invention discloses a device and a method for detecting helium content in natural gas and related application of the device and the method. The detection device comprises a shell, and an electric control unit, a gas path unit, a gas extraction unit and a mass spectrometer which are arranged in the shell, the gas extraction unit is respectively connected with the gas path unit and the mass spectrum analyzer, in a working state, the mass spectrum analyzer is vacuumized, sample gas entering from the gas path unit is extracted into the gas extraction unit and discharged, and reverse diffusion gas is generated in the sample gas discharging process and enters the mass spectrum analyzer; the mass spectrum analyzer is used for ionizing the reverse diffusion gas and detecting the content of target component gas in the sample gas; the electric control unit is electrically connected with the gas path unit, the gas extraction unit and the mass spectrum analyzer respectively so as to control the working states of the