The invention provides a manufacturing method of an enamelled wire. The manufacturing method comprises the steps of: forming a downward arc-shaped concave on the inner wall of an annealing pipe inside an annealing furnace; paying off a wire body and sending the wire body into the annealing pipe inside the annealing furnace for annealing treatment, so that a sag part of the wire body falls in the arc-shaped concave and the wire body is suspended in the arc-shaped concave; sending the wire body into a varnishing machine for varnishing; and baking and curing of a surface paint film of the wire body. The manufacturing method of the enamelled wire can overcome the problem that the surface quality of the enamelled wire is affected due to the phenomenon that the surface of the enamelled wire is scratched and abraded in the prior art.