High-pressure hydrothermal preparation process for reconstructed jadeite

The invention provides a method for preparing reconstructed jadeite, which comprises the following steps of: refining leftovers of natural jadeite, performing magnetic separation to remove black or dark-colored materials with magnetism from jadeite powder, proportioning raw materials, uniformly mixing in a mixer, performing ball milling by using a low-temperature high-energy ball mill, adding lead-free colorless glass, and performing ball milling again; and prepressing final powder for forming, putting a preformed compact into a high-pressure hydrothermal kettle, and sintering at the temperature of between 350 and 500 DEG C under the pressure of less than 45MPa, wherein 1 to 5 mass percent of coloring element, namely the natural jadeite with high chromium content, and 1 to 10 mass percent of lead-free colorless glass serving as a binder are added. By the method, scarce resources can be fully utilized, the natural polycrystalline aggregate jadeite is reconstructed by the high-pressure hydrothermal process and the like, and a natural jadeite imitation product with large volume and good color can be prepared on the basis of not changing the crystalline structure of the jadeite.