Manufacturing method of transformer coil winding can meet the design requirements and expansion of transformers with different specifications

A manufacturing method of transformer coil winding includes: manufacturing at least one secondary side coil, wherein the secondary side coil includes a disconnected annular body, a foot part is formed at each of two ends of the disconnected position, and a surface of the annular body is covered with an insulating layer; manufacturing two terminal bases, wherein each of the two terminal bases has a frame and a carrier connected to the frame, the frame and the carrier are both made of an insulating material, the frame has a frame hole, and the carrier is arranged with a plurality of metal terminals; arranging the secondary side coil to be between the two terminal bases and placing in a mold to fix, making the two frame holes of the two frames correspond to the ring hole of the annular body of the secondary side coil, injection molding in the mold to form a hollow bobbin tube between the two frame holes and the ring hole, and using the bobbin tube to connect the two terminal bases and the secondary side coil in