A resonant converter includes a first resonant conversion circuit, a second resonant conversion circuit, and a control unit. The first resonant conversion circuit has a first switch element and a second switch element, and the first switch element is ungrounded coupled to the second switch element and the second switch element is grounded. The second resonant conversion circuit has a third switch element and a fourth switch element, and the third switch element is ungrounded coupled to the fourth switch element and the fourth switch element is grounded. The control unit receives a feedback signal and controls the first resonant conversion circuit and the second resonant conversion circuit according to the feedback signal. Accordingly, it is to simplify circuit controls and increase the dynamic performance of phase controls.