The invention provides a heat-resistant shielding garment suitable for electrified operation of an extra-high voltage transmission line. The heat-resistant shielding garment comprises a shielding garment jacket, a shielding garment hat, shielding garment trousers, shielding garment gloves and a limb power heat dissipation mechanism used for reinforcing gas exchange inside the garment, wherein theshielding garment hat is integrally connected with the shielding garment trousers; the shielding garment trousers are located on the lower side of the shielding garment jacket; and the shielding garment gloves are connected with the shielding garment jacket. The invention relates to the field of shielding garment equipment. According to the heat-resistant shielding garment suitable for the electrified operation of the extra-high voltage transmission line, the high temperature resistance and heat insulation effects of the shielding garment can be enhanced, and human limb exercise can be used tostrengthen the internal gas exchange; other heat dissipation equipment does not need to be added; the structure is simple and light; and the problems that for a common shielding garment, the workingenvironment of workers is improved by enhancing the high temperature resistance and heat insulation performance of the shielding garment, the heat dissipation performance is relatively poor based on shielding, and heat is still easily accumulated in a long time to influence the work safety can be solved.