The utility model provides a device for differential coupling communication of high-speed power line carrier system, including A coupling streamline, a looks signal coupled ware, first clock signal, C coupling streamline, C looks signal coupled ware, second signal line, differential coupled linking ware, third signal line and high-speed power line carrier system terminal, a coupling streamline, a looks signal coupled ware, first clock signal is consecutive to be connect, C coupling streamline, C looks signal coupled ware, the second signal line is consecutive to be connect, first clock signal, second signal line all are connected with differential coupled linking ware, the one end and the differential coupled linking ware of said third signal line are connected, and the other end is connected with high-speed power line carrier system terminal the utility model has the advantages of the interference killing feature of reinforcing H-PLC network increases carrier signal's transmission distance, provides higher communication performance.