The invention discloses a quartz powder grinding machine, which comprises a cover plate, an inner box body, a milling roller, a baffle sheet, a bearing, a bottom device body, a belt wheel, a triangular belt, an output shaft, a feeding hopper, an outer box body, an installing plate, a motor, an upper rotating shaft, gear heads an a lower rotating shaft, wherein the inner box body is fixed inside the outer box body; the upper end of the cover plate is fixedly provided with the feeding hopper; the gear heads are arranged on the inner wall of the inner box body and the outer wall of the milling roller; the cross section shape of the milling roller is in a trapezoid shape; the upper and lower ends of the milling roller are respectively and fixedly provided with the upper rotating shaft and thelower rotating shaft; the lower rotating shaft of the milling roller is fixedly connected with the inner ring of the bearing; the outer ring of the bearing is fixedly connected with the inner wall ofthe outer box body; the tail end of the lower rotating shaft is fixedly provided with the belt wheel; the bottom end of the outer box body is fixedly connected with the upper end of a bottom box body; the belt wheel is arranged inside the bottom box body. The milling roller driven by the motor is arranged inside the inner box body; the quartz is milled through the rotation of the milling roller;the crushing effect is good.