The invention provides a heat-dissipation grading ring. The heat-dissipation grading ring comprises an electricity conducting rod, a leading-out terminal, a grading ring assembly and a heat conducting device, wherein the electricity conducting rod is arranged in a insulated sleeve which is about to be subjected to heat dissipation; the leading-out terminal is arranged on the insulated sleeve which is about to be subjected to heat dissipation and adjusts the voltage at the end of the insulated sleeve which is about to be subjected to heat dissipation, so that the voltage is distributed uniformly; the heat conducting device is arranged on the electricity conducting rod, connected with the grading ring assembly, and used for diffusing the heat generated by the electricity conducting rod. According to the heat-dissipation grading ring, the heat of the electricity conducting rod is diffused through the heat conducting device, so that the external heat-dissipation efficiency of the electricity rod is improved; meanwhile, the heat of the electricity conducting rod is transferred to the grading ring assembly through the heat conducting device so that the grading ring assembly not only can adjust the voltage at the end of the insulated sleeve to prevent coronas, but also can dissipate the heat of the electricity rod so as to further improve the external heat-dissipation efficiency of the electricity rod, therefore, the heat-dissipation performance of the insulated sleeve is improved, and the heating fault of the insulated sleeve is prevented.