The utility model provides the insulating barrel of a live-line boom type aerial platform, which comprises a barrel body, and a telescopic type roller mechanism fixed to the upper edge of the barrel body. The telescopic type roller mechanism comprises a fixing device fixedly connected with the insulating barrel. The top of the fixing device is provided with two connecting rods, and the two connecting rods are in hinged connection. A positioning sleeve is sleeved on each connecting rod respectively and the top of the connecting rod is connected with a U-shaped roller frame. A roller is arranged between supporting legs on the two sides of the U-shaped roller frame. Due to the adoption of the above technical scheme of the utility model, the space at the top of the insulating barrel is saved, and workers can conveniently conduct the related work. In addition, by means of the insulating barrel, a sufficient distance is reserved between wires and each of the two sides of the insulating barrel respectively, so that the protection effect is better. Meanwhile, due to the arrangement of a rolling bar, the abrasion of wires is relieved under the self-rotation effect of the rolling bar. Moreover, not only the safety of the live-line operation is ensured, but also the wire paying-off speed is greatly increased.