A mapping ablation catheter is provided comprising: a catheter conduit having a hollow inner space in which a guide member is disposed； a monitoring electrode unit arranged to surround the outer circumferential surface of the distal portion of the catheter conduit and perform a mapping on the lesion region by being in side-contact with a cardiac organ； an ablation electrode unit arranged to be spaced apart from the monitoring electrode unit and surround the outer circumferential surface of the distal portion of the catheter conduit and which removes the lesion region； a plurality of liquid discharge holes arranged on the outer circumferential surface of the ablation electrode； a current application unit which applies current to the monitoring electrode unit and the ablation electrode unit； and a liquid supply unit having a liquid supply tube, one end of the liquid-supply tube connected to the liquid discharge holes in the catheter conduit.
