The introduction of Fourier transform infrared spectroscopy (FTIR) has greatly improved the detection speed and accuracy of gas. However, in petrochemical leakage and explosion, forest fire and other emergency sites, there are some scences that human can not conduct on-site detection. In order to cope with this situation, a portable FTIR gas detection method based on mobile platform was designed. By combining the advantages of cloud server and Raspberry Pi, remote operation of mobile platform can be achieved. Then the mobile platform equipped with a portable FTIR spectrometer can be operated remotely and transported into the site, and the site location data, video data and spectral gas concentration data can be transmitted back timely through 4G/5G modules. Finally, the whole system device was tested in the field base, and CO₂, CO, SO₂, C₆H₆ and other pollution gases were detected. The test results verified that the system can work reliably in the field. This work provides idea and solution for the integrated application of FTIR spectrometer or other spectral detection systems on mobile platforms.