The portable helium ion detector for discharge decomposition products of JHSP-30 SF6 equipment adopts the principle of helium ionization gas chromatography, which can analyze 15 decomposition products such as H₂, O₂, N₂, CH₄, CF₄, CO, CO₂, C₂F₆, C₃F₈, SO₂F₂, SOF₂, SO₂, H₂S, COS, CS₂ in sulfur hexafluoride gas. Provide data support for judging whether there are latent faults such as spark discharge, arc discharge, gap breakdown, corona, and surface discharge in GIS, and ensure the safe operation of the power grid