Gas tank viewing window of gas insulating switch cabinet

The utility model relates to a component structure of high-voltage switchgear equipment, in particular to a gas tank viewing window of a gas insulating switch cabinet. The gas tank viewing window of the gas insulating switch cabinet comprises the window at a front wall board of the gas tank of the gas insulating switch cabinet; a convex lens hermetically connected with the border of the window is arranged in the window; a plurality of point light sources are arranged at the outer edge of the convex lens; and a reflector towards the point light sources is arranged at the outer front side of the point light sources. The gas tank viewing window can lead the light rays emitted by the point light sources into the interior of the gas tank by the convex lens and the reflector, thus improving the brightness in the gas tank. Simultaneously, an inner reflecting board is arranged, which enhances the scattering of the light rays in the tank. The structures can effectively improve the accuracy of observation on contact status of the switch, thus providing reliable basis for operators and maintenance personnel to accurately judge the running status of the switch and ensuring the reliable running of the equipment.