The invention discloses an electric spark auxiliary milling machining device, and relates to electric spark machining equipment. The electric spark auxiliary milling machining device is provided withan automatic feeding adjusting device, a milling cutter, graphite electrodes, a small vibrator, an adjustable resistor, a power supply and a workpiece. The vibrator is bundled on one sided of the pairof graphite electrodes, during the work of the vibrator, the vibrator drives the graphite electrodes bundled with the vibrator to vibrate together, the vibrator frequently in contact and disconnectedthe other sides of the graphite electrodes, so that the whole circuit to be switched on and off frequently, and the electric spark can be generated by the on-off of the circuit to be used for machining. The milling cutter is arranged above the workpiece, and the resistor is connected in the circuit in a series mode. According to the electric spark auxiliary milling machining device, the cutting burden of the milling cutter is reduced by virtue of the electric spark thermal erosion removing effect, the machining range is wide, the machining efficiency and precision are high, and the abrasion loss of the milling cutter is small.