The invention relates to an insulated ladder, in particular to an electric insulated ladder. The electric insulated ladder comprises a ladder body. The ladder body comprises two vertical rods and transverse rods connected between the two vertical rods. Connecting blocks are hinged to the top ends of the two vertical rods correspondingly. Supporting rods capable of being pulled penetrate through the two vertical rods and the connecting blocks correspondingly. Limiting blocks are arranged at the lower ends of the supporting rods. Pedals are oppositely arranged on the inner sides of the two supporting rods in a staggered mode, the tail ends of the pedals are close to the median line of the two vertical rods, and the pedals can be folded upwards by 90 degrees. Carrying discs are hinged to the tail ends of the connecting blocks. Grooves are formed in the outer sides of the lower ends of the vertical rods. Connecting rods are rotatably connected in the grooves. Universal wheels are arranged at the tail ends of the connecting rods. Each transverse rod is formed by sleeving of two telescopic rods. The vertical rods, the transverse rods, the connecting blocks, the supporting rods and the pedals are all coated with insulated paint. The insulated ladder is simple in structure, low in manufacturing cost, diverse in function, adjustable in height and width, convenient to use and safe in operation.