Purification method for deep silica removal of ammonium metavanadate

The invention discloses a purification method for deep silica removal of ammonium metavanadate. The method comprises the following steps: (1) pouring ammonium metavanadate into water; (2) adding acid for acidification; (3) carrying out solid-liquid separation; (4) adjusting pH to 7-9 by adding ammonia water; and (5) filtering to obtain ammonium metavanadate. According to the method, caustic soda flakes are not used, wastewater is not generated, and the product is high-purity ammonium metavanadate and ammonium sulfate solution and can be recycled.