The invention discloses sapphire high-aluminum glass. The glass is prepared from the following ingredients in mass percent: 55 to 67% of SiO2, 13 to 21% of Al2O3, 10 to 15% of Na2O, 2 to 5% of K2O, 2to 5% of MgO, 0.05 to 2% of CaO, 0.1 to 0.5% of B2O3, 0.3 to 0.7% of SnO2, 0.05 to 0.5% of Se, 0.1 to 0.5% of Pr6O11 and 0.01 to 0.2% of Co2O3. In preparation, a glass batch mixture is prepared according to the ingredients; then the glass batch mixture is molten to obtain molten glass liquid; then the glass liquid is processed by the steps of cast molding and annealing to obtain the sapphire high-aluminum glass. Different from existing traditional colored glass, the ingredients of the glass disclosed by the invention contain higher silicon dioxide and aluminum oxide; silicon dioxide and aluminum oxide are the key ingredients to improve the strength and the hardness of the glass. The sapphire high-aluminum glass disclosed by the invention achieves the purpose of sapphire and simultaneouslyensures improvement of the strength and the hardness of the glass; furthermore, a preparation technology is simple and easy to achieve.