High-insulation-strength rotary switch for precise high-resistance instrument

The utility model relates to a high-insulation-strength rotary switch for a precision high-resistance instrument. The switch comprises a switch body, wherein the contact discs comprise an upper contact disc, a lower contact disc, contact disc feet, an upper contact point and a lower contact point; the upper contact disc and the lower contact disc are respectively provided with six feet, and each foot is provided with three convex ribs which are arranged at intervals and two formed grooves, so that the superficial area of the side surfaces of the convex ribs in the grooves is increased, namely, the lengthened surface leakage area and the leakage-proof distance are increased. The surface leakage area is increased through the foot parts on the upper contact disc and the lower contact disc of the rotary switch, so that the surface can be prevented from being touched and contaminated, the surface insulation strength can be improved, and the insulation leakage caused by the surface is reduced. The improved rotary s