The invention relates to a high-strength transparent germinate glass ceramic and a preparation method thereof. The glass ceramic is prepared from, by weight, 51-65% of GeO2, 10-20% of Ga2O3, 0-18% ofSiO2, 5-12% of BaO, 3-12% of Y2O3, 2-8% of ZrO2 and 0.5-2% of Na2O. The method comprises the steps that firstly, according to the formula requirement, all the raw materials are mixed to be uniform, atraditional melt cooling method is adopted for preparing germinate base glass, the annealed base glass is machined to the proper specification and then thermal treatment is performed, a high-frequencyelectric field is formed between the upper and lower surfaces of a glass sample while high-temperature thermal treatment is performed, the thermal treatment temperature and time and the field intensity, frequency and application time of the high-frequency electric field are regulated, after the sample is cooled, and the high-strength transparent germinate glass ceramic with uniformly-distributednano-crystals is obtained. The optical transparency of the glass ceramic is larger than 78% within the range of 0.3-5.0 micrometers, and the bending strength of the glass ceramic can reach 106-125 MPa.