The invention relates to the field of metal part heat treatment equipment and provides plasma nitriding equipment. The plasma nitriding equipment comprises a furnace body and a furnace bottom plate. An insulator and a carrying platform are arranged in the furnace body. The carrying platform is connected with the furnace bottom plate through the insulator. The top of the furnace body is provided with a flow guide pipe and a container for containing a rare earth organic solvent. One end of the flow guide pipe is connected with the container. The other end of the flow guide pipe extends into the furnace body. A control valve and a rotating device used for driving the flow guide pipe to rotate are arranged on the flow guide pipe. The rotating device is connected with the flow guide pipe. By adopting the plasma nitriding equipment, the thickness of a nitration layer of a section extrusion die can be increased. Besides, the invention further provides a nitriding system of the section extrusion die. The nitriding system comprises a gas supply device, a vacuum device and the plasma nitriding equipment. The gas supply device and the vacuum device communicate with the interior of the furnace body of the plasma nitriding equipment correspondingly. By adopting the nitriding system of the section extrusion die, the nitriding efficiency of the section extrusion die can be improved.