System and method for preparing high-purity vanadium battery electrolyte-solution

The present invention belongs to the fields of chemical engineering and materials. Specifically disclosed are a system and method for preparing a high-purity vanadium battery electrolyte-solution; vanadium oxytrichloride is taken as a starting material, and distilled and purified to obtain high-purity vanadium oxytrichloride having a purity of 4N or higher; the obtained vanadium oxytrichloride is hydrolyzed and the chlorine content thereof is controlled; further, sulfuric acid is added to prepare and obtain a high-purity vanadium-battery mixed sulfuric-acid/hydrochloric-acid electrolyte solution. The present invention has the advantages of being very adaptable, having a simple process, being clean and non-polluting, having low energy consumption in production and low costs in operation, and the quality of the electrolyte solution being controllable; the invention is suitable for use in the large-scale continuous production of high-purity vanadium batteries, and has good economic and social benefits.