The invention relates to a high-thermal-
conductivity and high-electric-
conductivity PC / ABS 
composite material and a preparation method thereof. The high-heat-
conductivity and high-electric-conductivity PC / ABS comprises PC, ABS, a 
toughening agent, a 
graphite heat-conducting filler, a 
cellulose heat-conducting filler, a 
coupling agent, a main 
antioxidant, an auxiliary 
antioxidant and a lubricatingagent, wherein the 
graphite heat-conducting filler and the 
fiber heat-conducting filler are respectively subjected to 
polyvinyl alcohol coating modification and 
coupling agent modification treatment in advance; and blending, melting and extruding are carried out to obtain heat-conducting filler master batch, and the heat-conducting filler master batch is compounded with other 
raw material components. According to the high-heat-conductivity and high-electric-conductivity PC / ABS 
composite material, a multi-heat-conductivity and multi-electric-conductivity 
percolation network is constructed by compounding the 
graphite heat-conducting filler and the 
fiber heat-conducting filler, and the graphite heat-conducting filler and the 
fiber heat-conducting filler are subjected to 
surface chemical modification in combination with pretreatment of 
polyvinyl alcohol coating and 
coupling agent treatment; The electric conduction and heat conduction performance is effectively improved, and the 
impact resistance of the material can be enhanced.