The invention relates to yttrium aluminum silicate glass ceramic containing Y4.67(SiO4)3O apatite crystalline phase and a preparation method thereof. The preparation method comprises the following steps: S1, uniformly mixing the raw materials in proportion, heating to a molten state, and keeping the temperature to be constant, curing the molten liquid for molding, insulating to a preset time, andcooling to obtain yttrium aluminum silicate glass; S2, performing first heating on the yttrium aluminum silicate glass, insulating, nucleating, performing second heating, insulating, crystallizing, and cooling to obtain the yttrium aluminum silicate glass ceramic. According to the preparation method, the glass is subjected to crystallizing heat treatment after being molten from Y2O3, Al2O3 and SiO2 in the proportion, so that massive yttrium aluminum silicate glass ceramic having the main crystalline phase being Y4.67(SiO4)3O apatite can be prepared, the preparation process is simple, the operation is simple and convenient and the production cost is low, and massive Y4.67(SiO4)3O apatite crystal can be prepared in a short time.