The invention relates to an automatic testing system of an electromagnetic interference power filter. The automatic testing system is characterized in that the system is composed of a computer, a voltage-resistant instrument, a parameter instrument and a controlling unit, wherein the computer is respectively connected with the voltage resistant instrument and the parameter instrument through passive GPIB cable lines, and is connected with the controlling unit through a cable strip; the high voltage output end of the voltage-resistant instrument is connected with the high voltage input end of the controlling unit; and the input end of the parameter instrument is connected with the connecting terminal of the controlling unit. The automatic testing system has the advantage that the working efficiency is enhanced.