The utility model relates to a device for cooling off transition roller head, including fixing base (1), the fixing base passes through bearing (3) cooperation connecting axle bearing (2), and rotatory flood peak (5), its characterized in that are connected in the one end cooperation connection transition roller (4) of fixing base, other end cooperation: the fixing base is equipped with an internal cooling chamber (1a) with one side that rotatory flood peak is connected, and the internal cooling chamber is linked together with rotatory flood peak, and in one pipe (6) of through -hole (5a) fit in connection of rotatory flood peak, a cooling source (9) is connected to the one end of pipe, the other end stretches into in the internal cooling chamber (1a). Be equipped with annular diaphragm (2a) in the bearing frame, outer cooling chamber (2b) and bearing bore (2c) are cut apart into with the inner chamber of bearing frame to annular diaphragm. The utility model discloses an advantage: this device is changed lessly to original mounting, temperature that it has not only reduced the bearing improves bearing life, has improved the surface temperature of transition roller moreover.