The invention discloses an ethylene-propylene-diene monomer cable accessory which comprises the following components in parts by weight: 100 parts of ethylene-propylene-diene monomer, 1-5 parts of zinc oxide, 0.5-3 parts of stearic acid, 10-80 parts of carbon black, 5-50 parts of white carbon black, 10-200 parts of filler, 0.2-10 parts of vulcanizing agent, 5-40 parts of heat conducting material, 0-50 parts of structural control agent, 0-8 parts of vulcanizing agent and 0-5 parts of accelerant. The ethylene-propylene-diene monomer cable accessory disclosed by the invention has good heat conductivity and insulativity, and particularly a compound heat conducting material with different grain sizes, different heat-conducting properties and different reflection coefficients of heat energy and other components such as the ethylene-propylene-diene monomer form a crossover network, so that the heat conducting network has efficient heat conduction, the heat conductivity coefficient can be improved to 30.13-5.142w/m.k and the volume resistivity is 1015 ohm*cm. Therefore, not only can the insulating effect of the cable accessory be guaranteed, but also the heat conducting effect of the cable accessory is guaranteed, so that the cable normally operates.