The invention relates to the technical field of wire drawing dies and discloses a diamond wire bus wire drawing die which comprises a cylinder and a cleaning tube, wherein the cleaning tube is positioned at the lower end of the cylinder, a through hole is concaved in the upper surface of the cylinder, an inlet area, a compression area, a sizing area and an outlet area are sequentially arranged on the through hole from top to bottom, the diamond wire is primarily compressed into wires through the compression area, the diamond wire is finally shaped into wires through the sizing area, the diamond wire bus wire drawing die enables a large semicircular ring and a small semicircular ring to be mutually close by rotating two screw rods, so that polishing pads on the inner walls of the large semicircular ring and the small semicircular ring are attached to the outer surface of the diamond wire, and before the diamond wire is drawn, impurities on the surface of the diamond wire are polished, so that the surface of the diamond wire becomes smooth, and adverse effects on the appearance and quality of the diamond wire caused by pressing the impurities on the surface of the diamond wire in the wire drawing process are avoided.
