High-voltage electrostatic insulating ceramic insulator with limiting function

The invention relates to a high-voltage electrostatic insulating ceramic insulator with a limiting function. The ceramic insulator comprises an insulator main body, wherein the insulator main body isa long waist-shaped body; bosses, outer diameters of which re same as the width of the long waist-shaped body are arranged at two ends of the long waist-shaped body; the two bosses are respectively located on two sides of the long waist-shaped body in the thickness direction; and a through hole for the passing of ring rod of an electric field is formed between the two bosses. A limiting lamping key is arranged on one boss; and the limiting clamping key is embedded in a corresponding opening on an electric field polar plate to ensure that the electric field polar plate cannot deflect or displace and then the whole electric field structure is stabilized. The insulator is capable of generating and controlling the insulating distance. The bosses at two ends are capable of isolating the electric field polar plate from the insulator main body, so that negative and positive polar plates are prevented from directly creeping from the side surface of the insulator main body. By adoption of the design, the normal work of the insulator is not influenced even a large number of oil contaminations or particulate matters are stacked on the polar plates.