An insulating heat-radiating coating composition including a coating layer-forming component including a main resin; and an insulating heat-radiating filler, which not only is capable of exhibiting excellent heat-radiating performance due to excellent thermal conductivity and heat radiation but also forms an insulating heat-radiating coating layer having a heat-insulating property. In addition, an insulating heat-radiating coating layer formed using the insulating heat-radiating coating composition has excellent adhesiveness to a surface to be coated, thereby remarkably preventing the peeling of an insulating heat-radiating coating layer during use and maintaining the durability of the insulating heat-radiating coating layer against physical and chemical stimuli such as external heat, organic solvents, moisture, and impact after formation of the insulating heat-radiating coating layer.