The invention relates to the technical field of electrostatic precipitation, in particular to an anti-pollution hanging device for an electrostatic precipitator cathodic system. The technical scheme includes the anti-pollution hanging device for the electrostatic precipitator cathodic system comprises a hanging rod, an insulating guard, an porcelain insulator and a base; the insulating guard, theporcelain insulator and the base are arranged from top to bottom sequentially, the hanging rod penetrates the insulating guard, the porcelain insulator and the base sequentially, a conical groove is formed in the upper end of the base, a circular air-guide groove is formed in the bottom surface of the conical groove, the lower end face of the porcelain insulator covers the opening of the circularair-guide groove along the circumference partially, the base is provided with an air outlet running through the upper end and the lower end thereof and disposed on the inner side of the circular air-guide groove, the hanging rod penetrates the base through the air outlet, a circular air-guide plate is arranged on the lower end face of the insulating guard, and is used for guiding air of an air-guide passage to the outer wall of the porcelain insulator. According to the technical scheme, the device can prevent the porcelain insulator from pollution flashover.