The invention relates to the technical field of wire insulation, and discloses a manufacturing method of an insulation coating structure of a bare conductor. The method comprises manufacturing an insulation layer with the thickness of 1 mm to 3 mm according to the perimeter of the bare conductor; forming a fiber layer on the inner surface of the insulating layer; and spraying the inner surface ofthe fiber layer to form a bonding layer. By adopting the manufacturing method provided by the invention, the insulation layer, the fiber layer and the bonding layer are sequentially arranged, the bonding layer is directly bonded on the outer surface of the bare conductor after the insulation coating structure is manufactured and in use, the insulation layer can realize an insulating effect, the construction is simple and convenient, and the cost is low. Meanwhile, the fiber layer arranged in the middle can enhance the structural strength, and the insulation effect is ensured. The insulation coating structure is simple in structure, good in use effect and easy to popularize and use.