The invention discloses a mixed liquid crystal production method, and solves the problems that in the prior art, in mixed crystal production, small glass containers are used, an intermittent artificial production mode is adopted, the production efficiency is low, the measurement error is large, the production yield is small, and the product quality is not stable. The method comprises following steps: according to a mixed crystal formula, adding at least two monomer liquid crystal solutions (or at least one monomer liquid crystal solution and at least one monomer liquid crystal) into a production device to obtain a mixed liquid crystal solution, wherein the monomer liquid crystal solution comprises monomer liquid crystal and an organic solvent; filling inert gas into the production device,controlling the temperature, stirring the mixed liquid crystal solution; after stirring, distilling the mixed liquid crystal solution in vacuum so as to separate the organic solvent; after distillation, adding an adsorbent into the distilled mixed liquid crystal solution, stirring the solution at a controlled temperature, after stirring, and filtering the mixed liquid crystal solution to separatethe adsorbent to obtain mixed liquid crystal. The quality of mixed liquid crystal is improved, and the production capacity of mixed liquid crystal is enhanced.