High precision diamond dressing roller is a new type of tool for the truing and dressing of grinding wheels. Compared with traditional single diamond dressing point, dressing roller has much higher efficiency and can obtain more accurate and stable faces of grinding wheels. By using dressing roller, dressing process can be completed efficiently in one process needing only one machine instead of previous several processes needing several machines. They are widely used in the line of automobile, bearing, gears, aerospace, tooling and light machines.