The utility model relates to a ball mill for quartz sand grinds, including the ball mill body, set up feed inlet and discharge gate on the ball mill body, feed inlet and discharge gate are connected with the conveying pipeline way, and this internal grinding cylinder body that is provided with of ball mill is provided with a plurality of grinding ball that are used for the grinding in, and the conveying pipeline way that lies in discharge gate one end is connected with the draught fan, the discharge gate is provided with and prevents that grinding ball from falling the ejection of compact plate structure from grinding cylinder body, is provided with the discharge opening in the ejection of compact plate structure. The utility model discloses can effectively solve present ball mill in the course of the work, the play flitch in it is punctured by grinding ball easily influences normal work, and the interior problem that influences the product quality of quartz powder is easily sneaked into to the metal that goes out on the flitch.