A dual input power supply is provided, which comprises a dual input, a connector, a power converter circuit and an output. The dual input has a first input and a second input. The connector is an integrated magnetic element used for integrating the input powers having different power signals from the first input and the second input. The power converter circuit comprises an AC-to-DC converter, a DC-to-DC converter, a feedback circuit and a filter circuit. In the present invention, the dual input uses a set of transformer coils or inductive coils, thus the size of the present power supply can be reduced.