The utility model is suitable for an electric power system overhauls technical field, provides a head is annotated to insulating coating, it annotates the head body to set up relatively including two, annotate the head body including half annular housing who has certain thickness, half annular housing is hollow structure, half annular housing inner wall evenly distributed has a plurality of discharge gates, the terminal surface still is provided with the feed inlet before half annular housing, discharge gate and feed inlet all communicate extremely inside half annular housing, follow the circular arc baffle has outwards been drawn forth to the internal diameter pitch arc position of half annular housing rear end face, the throat gradually of circular arc baffle. Notes are scribbled the insulating layer robot and are removed the in -process along the wire, and the cowl of half annular housing rear end face can be with drawing in in along the coating polymerization, and coating thickness uniformity has been guaranteed on the air wire surface to even coating.