A current-sharing power supply apparatus includes a conversion circuit, a square-wave generating circuit, a resonant circuit, a rectifier circuit, and a filter circuit. The conversion circuit has two transformers, and each of the transformers has a primary winding and at least one secondary winding. More particularly, two secondary windings of the two transformers are electrically connected in series. The square-wave generating circuit is electrically connected to a DC voltage to switch the DC voltage into a pulsating voltage. The resonant circuit is electrically connected to the square-wave generating circuit, and having a first capacitor and the primary windings of the transformers. The rectifier circuit has at least two switch components, and electrically connected to the secondary windings of the transformers to rectify an AC output voltage into a rectified voltage, and the rectified voltage is outputted to at least one voltage output terminal.