The invention relates to a method for preparing a nano-microlite plate by utilizing CRT (Cathode Ray Tube) screen glass. The method disclosed by the invention comprises the following steps: firstly, crushing screen glass of a waste cathode ray tube, an electronic gun of which is removed, and melting by adding auxiliary raw materials to prepare concentrated pigment; and then, mixing and forming CRT screen glass power and concentrated pigment powder according to the mass fraction, heating, crystallizing, and cooling to obtain nano-microlite. The nano-microlite plate prepared by using the preparation method disclosed by the invention is low in porosity and water absorption, high in strength, small in colour difference, simple in sintering process and low in cost; the utilization rate of the CRT screen glass is high; furthermore, pollution to the environment cannot be generated in the production and use processes; the nano-microlite plate is high in acid-base resistance property and abrasion resistance and free from radioactivity harm, and can be used as a novel high-grade decorative plate; the preparation method disclosed by the invention is simple in operation process and low in cost; the production cost of nano-microlite can be effectively reduced; the environment is protected; wastes are turned into wealth; and thus, the method disclosed by the invention is applied to large-scale industrialization production and has obvious economic benefits and environment-friendly benefits.