A transformer structure with high magnetic permeability utilization is provided. The transformer structure includes a first magnetically permeable unit, at least one winding and a second magnetically permeable unit. The winding is wound around a winding portion of the first magnetically permeable unit to generate magnetic flux in the winding portion of the first magnetically permeable unit. The first magnetically permeable unit includes a first coupling structure and the second magnetically permeable unit includes a second coupling structure. The first coupling structure and the second coupling structure extend to an edge area of the transformer structure. The magnetic flux from the winding portion of the first magnetically permeable unit flows to the first coupling structure and the second coupling structure in sequence when the first coupling structure is coupled to the second coupling structure.
