Inner container of sand mill

The utility model relates to the technical field of sand mills, and discloses a sand mill inner container which comprises a grinding device, the grinding device comprises a grinding cylinder, a plurality of rod pins are arranged on the surface of the grinding cylinder, the rod pins are rotated to stir ink, the grinding cylinder is provided with a cavity and a plurality of long-strip-shaped through holes, and the grinding cylinder is made of polyurethane materials. The rod pins are made of polyurethane materials, the grinding cylinder is fixedly provided with a bearing, the bearing is fixedly provided with a flange, the grinding cylinder is rotationally connected with the flange through the bearing, the flange is fixedly provided with a motor, and the output end of the motor is fixedly connected with the grinding cylinder. When the inner container and the rod pin of the sand mill rotate to grind ink, the rod pin serves as a stirring rod to stir the ink, so that ink particles in the ink are dispersed, the rod p