High-temperature-resistant glass, preparation method thereof, glass prefabricated part and optical element

The invention discloses high-temperature-resistant glass, a preparation method of the high-temperature-resistant glass, a glass prefabricated part and an optical element. According to the high-temperature-resistant glass disclosed by the invention, positive ions of the high-temperature-resistant glass contain 22.50 mol percent to 23.25 mol percent of Si < 4 + >, 7.39 mol percent to 8.02 mol percent of Al < 3 + >, 7.18 mol percent to 7.71 mol percent of Na < + >, 0 to 0.55 mol percent of K < + >, 0.05 mol percent to 0.07 mol percent of Sn < 4 + > and 0.06 mol percent to 0.12 mol percent of Cu < 2 + >; the anion of the high temperature resistant glass contains 61.23 mol%-61.60 mol% of O2 <-> in terms of the mole percentage of the anion. The melting temperature of the prepared high-temperature-resistant glass material is far lower than that of quartz glass, and meanwhile, the high-temperature-resistant glass material has relatively high softening point temperature and relatively high glass ...