The utility model relates to an automatic performance measuring device of a power wire carrier communication channel, comprising a central processing unit, an analog-to-digital conversion module communicated with the central processing unit, a digital-to-analog conversion module, a synchronous dynamic random access memory, a digital signal processor, an RS232 serial interface module and an analog front end module, wherein the synchronous dynamic random access memory is communicated with the RS232 serial interface module; and the analog front end module is provided with an input and output interface for connecting with coupling equipment, the signal output end of the analog front end module is connected with an input port of the analog-to-digital conversion module, and the signal input end is connected with a signal output port of the digital-to-analog conversion module. The device realizes high-integration automatic performance measurement of the power wire carrier communication channel and is convenient for the measurement of different performances of the power wire carrier communication channel; and the performance automatic measuring device automatically carries out the transmission of measuring signals and the analysis and output of measuring results without manual intervention and has short measuring time, accurate result and no influence on other kinds of equipment in a power wire network.