The invention discloses a glass ceramic for tooth implanting and a preparation method thereof. The glass ceramic comprises the following raw materials in parts by weight: 50 to 70 parts of silicon dioxide, 20 to 70 parts of magnesium oxide, 30 to 40 parts of calcium hydrogen phosphate, 20 to 30 parts of phosphorus (VI) pentoxide, 15 to 25 parts of silicon carbide, 10 to 20 parts of zinc, 12 to 20 parts of polytetrafluoroethylene, and 30 to 40 parts of ethyl cellulose. The preparation method comprises the following steps: evenly mixing silicon dioxide, magnesium oxide, calcium hydrogen phosphate, phosphorus (VI) pentoxide, silicon carbide, zinc, polytetrafluoroethylene, and ethyl cellulose, melting, heating to a temperature of 1300 to 1400 to carry out reactions for 2 to 3 hours; cooling rapidly, grinding, sieving, cold-pressing, moulding, and sintering. During the preparation process, powder is firstly produced through moulding, then glass ceramic is prepared from the powder to avoid the direct forming of a large piece of glass, which is easy to break, and thus the product quality is improved. Moreover, the glass ceramic prepared by the provided method has a small porosity and is compact and cracking-free.