The invention relates to a combined type insulation cable ladder including step cases, bearing beams, cushion blocks, and steps. The step cases are laid in a bilaterally-symmetrical multi-layer step structure, the distance between the step structures at the left and right sides is adjustable, two cushion blocks are respectively arranged on the step boxes at the top parts of the left and right sides, the two bearing beams are arranged on the cushion blocks at the left and right sides in a lap joint manner, and the steps are arranged on the bearing beams. Compared with the prior art, the combined type insulation cable ladder can be randomly combined at different height and length as needed, is convenient to detach and combine, and wide in application; if the ladder is applied to a power cable room, the labor intensity of operators is greatly improved; and the step cases, the bearing beams, the cushion blocks, and the steps are made of insulation materials, and the use safety is high.