The utility model discloses an auxiliary rack for an electroscope. The auxiliary rack is composed of an electroscope rod, an extension rod and a holding rod, wherein the electroscope rod and the extension rod respectively include hollow tubular structures, a lead is arranged inside the electroscope rod and the extension rod, and the outer surfaces of the electroscope rod and the extension rod are wrapped in elastic insulating umbrella-skirt projections; the front end of the electroscope rod is provided connecting threads, an L-shaped connecting hook and a conductive armature, and the tail end of the electroscope rod is provided with a connecting mechanism; the connection ends of the extension rod are respectively provided with connecting mechanisms, the connecting mechanism at one end is protruded out of the extension rod, and the connecting mechanism at the other end is embedded into the extension rod; and the front end of the holding rod is provided with a connecting mechanism and an elastic insulation guard ring, and the electroscope rod is connected with the holding rod via connecting mechanisms of at least one segment of the extension rod. The auxiliary rack for the electroscope is characterized by small volume and low weight, is extremely convenient to carry, dismount and mount, provides convenience for installation of the electroscope and display and reading of values, effectively enhances the insulation and anti-creepage performances, and greatly improves the using safety.