The invention provides an insulating rubber, a preparation method thereof, an insulating rubber glove, and a preparation method thereof. The insulating rubber comprises following raw materials: butylrubber, alumina, a promoter, naphthenic oil, microcrystalline wax, low density polyethylene, polyethylene glycol, and polyester fiber. A composite material is prepared at first, and then the compositematerial is used to prepare the insulating rubber glove. The composite material has an excellent insulating performance and mechanical properties, and thus the insulating glove prepared from the composite material has a good insulating performance and mechanical properties. The insulating glove can be applied to high voltage maintenance. The insulating glove is provided with a ground lead, whichcan introduce current to the ground, when the insulating glove is broken down by a high voltage, thus the current will not go through the maintenance personnel, the damage to the maintenance personnelis prevented, the safety coefficient is largely increased; the grounded lead is provided with a counterweight bead to ensure the grounding effect of the grounded lead; the grounded lead is in a spiral elastic ring shape, on the premise that the grounding effect is not influenced, the excess part of the grounded lead can be automatically compressed, the space is saved, and the storage becomes convenient.