The invention discloses a wiring module of a tap switch of a transformer, and relates to the technical field of transformer assembly; the wiring module comprises a module body with a columnar surface and an annular sleeve ring sleeve on the module body; the annular sleeve ring sleeve can vertically glide along the columnar surface of the module body, and the module body is erected on the supporting mechanism. Through different positions of the annular sleeve ring on the module body, length of a tapping wire at the connection terminals of different loaded switches can be simulated, and the loaded switch of the transformer can be wired in advance, thereby improving the wiring accuracy of the tapping wire, avoiding waste of the tapping wire, greatly saving materials, labor time, energy source consumption, and greatly saving production cost. The wiring module is simple in structure, convenient to operate, simple in manufacture, low in cost, and can be suitable for the wiring of the loaded switches of multiple transformers, and recycled for many times.