The invention discloses a shoulder wedge 
composite material and a manufacturing method thereof. The shoulder wedge 
composite material consists of the following raw materials in part by weight: 100 parts of 
natural rubber, 10 to 50 parts of carbon series nano thermal conducting filler, 10 to 35 parts of 
coarse particle size 
carbon black, 2 to 6 parts of octyl phenolic resin, 2 to 4 parts of surfactant, 1 to 8 parts of 
silane coupling agent, 1.5 to 9 parts of vulcanizing agent and the balance of other common aids. The preparation method comprises the following steps of: plasticating the rubber in an internal mixer, adding the 
coarse particle size 
carbon black, the carbon series nano thermal conducting filler, the octyl phenolic resin, the surfactant and the other aids into the internal mixer, mixing and controlling the temperature to be between 80 and 120 DEG C; adding the 
silane coupling agent into the mixture, controlling the temperature to be between 120 and 160 DEG C, and discharging the 
sizing material; adding a master batch and the vulcanizing agent into the internal mixer and discharging products until the temperature is 80 to 120 DEG C, wherein if the other aids contain scorch 
retarder, the scorch 
retarder and the vulcanizing agent are added together. The shoulder wedge 
composite material provided by the invention meets the requirements of mechanical properties, and is low in themogenesis, high in 
thermal conductivity, and excellent in 
machinability.