The utility model discloses a conveying roller, including central roller and outer roller, said outer roller with through first end cover and second end cover fixed connection between the roller of center, said first end cover with second end cover interval sets up and forms a cavity, the axial is followed to the center roller is provided with the blind hole, the drill way of blind hole is seted up the one end of center roller is as the water inlet, the breast roll is epaxial is provided with radial through-hole, said through-hole will said blind hole with said cavity intercommunication, on the second end cover is provided with the delivery port. During the use, supply water the butt joint of delivery pipe and water inlet, central roller rotates the outer roller of drive and rotates and carry out the transport of casting blank, and the cooling water gets into the blind hole and sprays from the through-hole and flows into the cavity, and with filling with the cooling water in the cavity, the external roller of cooling water cools off, is detained a period postcooling water and flows out from the delivery port, the improvement cooling effect