The invention relates to the field of glass materials, and discloses high temperature resistant tempered glass and a preparation method thereof. The tempered glass comprises, by weight, 50-55 parts ofquartz sand, 10-20 parts of alumina, 10-13 parts of sodium carbonate, 4-6 parts of mirabilite, 10-15 parts of dolomite, 3-5 parts of feldspar, 1-2 parts of ceraphite, 3-5 parts of limestone, 1-3 parts of cosolvent, 0.2-0.5 part of cerium oxide composite clarifying agent, 1-2 parts of coloring agent, 10-15 parts of cullet, 1-3 parts of titanium oxide, 1-2 parts of antimony oxide, 0.5-1 part of yttrium oxide and 15-20 parts of high temperature resistant component. According to the tempered glass, components in the glass composition have a synergistic effect, so that the stress relaxation of theobtained glass is effectively improved, and the tempered glass has the advantages of enhanced compressive stress, deep strengthening depth, high impact strength, high temperature resistance and the like.