The invention relates to a mounting structure for an assembly type cable duct bank, wherein the mounting structure has characteristics of industrialized production, high finished product quality, and fast production speed. The mounting structure comprises cable protection tubes having hollow structures, wherein cable can pass through the cable protection tubes; and the outer cross sections of the cable protection tubes have rectangular structures. A limiting tenon protruding outwardly is arranged at at least one side of each cable protection tube; and a groove into which the limiting tenon can be embedded is formed in one side, opposite to the one side with the limiting tenon, of the cable protection tube. The mounting structure is formed by superposition of a plurality of cable duct bank layers; a plurality of cable duct banks are arranged at each layer. Limiting channel irons for limiting the cable protection tubes to move in radial directions are arranged at the two sides of the cable protection tubes at the bottom. A pillow is arranged at the lower ends of the cable protection tubes at the bottom and is arranged on the ground with broken stone bed layer. The assembly type cable duct bank can be constructed mechanically; and the construction progress is fast. Form erecting and concrete pouring can be avoided and concrete maintenance is not required, so that the construction time can be saved substantially.