The present invention relates to a mapping ablation catheter having a distal portion which is inserted into a human body to cure a lesion region, comprising: a catheter conduit having a hollow space in which a guide member is disposed; a monitoring electrode unit which is arranged to surround the outer circumferential surface of the distal portion of the catheter conduit and which performs mapping on the lesion region by being in side-contact with a cardiac organ when the catheter conduit is inserted into the cardiac organ; an ablation electrode unit which is arranged to be spaced apart from the monitoring electrode and to surround the outer circumferential surface of the distal portion of the catheter conduit and which removes the lesion region when current is applied; a plurality of liquid discharge holes which are 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 which has a liquid supply tube, one end of the liquid-supply tube being connected to the liquid discharge holes in the catheter conduit.