Glass insulator

A double-umbrella glass insulator comprises a disk-shaped glass piece with the upwardly-protruded middle part. The inner side of the protruded part of the glass piece is glued with a steel leg through cement compo; the outer side of the protruded part of the glass piece is glued with a steel cap through cement compo; an R-type locking pin and a W-type locking pin are arranged in the cavity at the upper part of the steel cap; a gasket is arranged between the steel cap and the glass piece; and the glass piece is provided with two main umbrella skirts extending in the radial direction, wherein, the upper main umbrella skirt extends outwards from the protruding part arranged in the middle of the glass piece, the lower main umbrella skirt is connected with the middle of the upper umbrella skirt, the upper main umbrella skirt and the lower main umbrella skirt extend outwards, one or three concentric round-shaped umbrella fringes are arranged below the upper main umbrella skirt or in the interior of the lower main u