Preparation method of anhydrous rare earth iodide and anhydrous rare earth iodide

The invention relates to the technical field of rare earth iodide, in particular to an anhydrous rare earth iodide preparation method and an anhydrous rare earth iodide, the anhydrous rare earth iodide preparation method comprises: according to a preset molar ratio, mixing and heating a rare earth metal RE raw material and a ZnI2 raw material to obtain a first reactant, the first reactant comprising REIx and metal Zn; metal Zn in the first reactant is removed, a second reactant is obtained, and the second reactant comprises REIx; wherein x is 2 or 3. The anhydrous rare earth iodide is prepared from ZnI2 as a raw material, Zn is a non-toxic and harmless substance, compared with a metal halogenation method, elemental iodine is not used, the explosion risk is avoided, and the safety is greatly improved; compared with a mercury iodide replacement method, toxic and harmful mercury iodide and mercury elementary substance are not used, so that the method has better safety and environmental friendliness; and Zn is hi