The invention discloses fire-resistant polysiloxane composition and application thereof. The composition is prepared from the materials of 100 to 150 parts of polysiloxane base body, 40 to 90 parts of oxide, 0 to 75 parts of phosphoric acid and / or phosphate, 0 to 18 parts of zinc borate, 0 to 1 part of catalyst, 1 to 3 parts of peroxide crosslinking and 0 to 28 parts of reinforcing agent, wherein the catalyst is selected from one of rhodium-containing compound, platinum-containing compound and iridium-containing compound or a mixture of the rhodium-contained compound, the platinum-contained compound and the iridium-contained compound. According to the fire-resistant polysiloxane composition, a production technology is simplified, and energy is remarkably saved; the fire-resistant polysiloxane composition has insulation property, filling property, oxygen insulation property, fire insulation property, thermal insulation property, flame resistance, fireproof property and fire resistance, is mainly applied to new-energy electric vehicles, can remarkably reduce loss of the new-energy electric vehicles on fire, also can be used for manufacturing an insulator or a filling body or an oxygen insulation body or a fireproof body or an inner protection layer of a cable, can be used as a thermal-insulation, fireproof and heat-preservation material of aircrafts, ships, warships, high-speed rails and buildings, and has good application prospect.