The invention relates to energy-saving high-strength microcrystalline glass and a preparation method thereof. The energy-saving high-strength microcrystalline glass solves the prior art problem of energy waste, and is prepared from 40-55wt% of SiO2, 21-45wt% of CaO, 16-30wt% of MgO, 0-3wt% of Al2O3, 1-8 or 0wt% of a nucleation agent and 0-2wt% of a flux or from 48-55wt% of SiO2, 23-26wt% of CaO, 15-18wt% of MgO, 0-6wt% of Al2O3, 0-8wt% of a nucleation agent and 0-1wt% of a flux by melting. The preparation method comprises the following steps of melting the above raw materials according to the above weight ratio to obtain a glass liquid, carrying out cooling and molding, feeding the molded glass into a roller kiln, carrying out nucleation and crystallization treatment at a low temperature for short time and then carrying out annealing treatment to obtain artificial jade or microcrystalline glass, or comprises when a nucleation agent use ratio is 0, melting the rest of the above raw materials to obtain a glass liquid, carrying out cooling and molding, and carrying out annealing treatment to obtain high-strength glass. The energy-saving high-strength microcrystalline glass has the advantages of low melting temperature, short crystallization time, good chemical, mechanical and electrical performances of the product, energy saving and low cost.