The present disclosure provides a touch display panel and a driving method thereof The touch display panel includes a common electrode layer including a first common electrode and a second common electrode spaced apart from each other, the touch display panel further comprises a touch signal source, a switch layer and a common wire, each display cycle of the touch display panel comprises a display stage and a touch stage, the touch signal source can provide a touch signal to the first common electrode in the touch stage, the common wire is connected to a common voltage output terminal, the second common electrode is electrically connected to the common wire, and the switch layer comprises a first switch element for electrically connecting the first common electrode with the common wire in the display stage, and disconnecting the first common electrode from the common wire in the touch stage.