Enameled wire, production process thereof and transformer adopting enameled wire

The invention relates to the technical field of enameled wires. The invention discloses an enameled wire, a production process thereof and a transformer adopting the enameled wire, the enameled wire comprises a core wire and a paint layer, and the paint layer is wrapped outside the core wire; the core wire is a flat wire and comprises a copper layer and an aluminum core, and the copper layer wraps the aluminum core; the inner wall of the copper layer is provided with a plurality of annular grooves which are axially arranged, and the outer wall of the aluminum core is provided with protrusions which extend into the annular grooves. The enameled wire is a flat wire with copper-clad aluminum as the core wire, the bonding strength of the copper layer and the aluminum core is improved through the multiple annular grooves formed in the copper layer and the aluminum core in the axial direction, relative movement of copper and aluminum caused by large environment temperature difference can be effectively prevented, a