Processing device and processing method of low-speed diesel engine rack guide plate

The invention discloses a processing device and a processing method of a low-speed diesel engine rack guide plate. A portal-milling numerical control machine tool is adopted; a portal frame is arranged on a platform; and the spindle ram of the machine tool is arranged on the cross beam of the portal frame. The processing device is characterized in that the low end of the spindle ram of the machine tool is provided with a milling head, and the two sides of the milling head are fixedly provided with a left rotary cutter disc and a right rotary cutter disc respectively by virtue of joint chairs. By utilizing the processing device and the processing method of the low-speed diesel engine rack guide plate, the processing efficiency can be effectively improved.