The invention relates to gas insulated metal-enclosed switchgear and an observation device thereof. The gas insulated metal-enclosed switchgear comprises an equipment shell with an observation opening, and the observation device is arranged at the observation opening; an observation channel in the base body of the observation device corresponds to the observation opening; a concave objective lensis arranged at the position, close to the observation opening, of the front end of the observation channel; a convex eyepiece for observing a real image formed by the concave objective lens is arranged on the rear side of the concave objective lens of the observation channel; the observation visual field of view can be expanded through the concave objective lens; in direction observation, the realimage with a relatively small size formed by the concave objective lens is amplified by the convex eyepiece, so that observation can be performed conveniently; and in remote observation, a camera isinstalled in the observation channel, so that an image inside the equipment shell is acquired through the matching of the lens in the camera and the concave objective lens, and remote observation is realized. By virtue of matching of the concave objective lens and the convex eyepiece or the camera, the observable range is enlarged, and a clear image can be obtained.