Embodiments of the present application disclose a radiofrequency ablation catheter and a system. The radiofrequency ablation catheter includes: a catheter body； a localization sensor fixedly arranged inside the catheter body； and ablation electrodes fixedly arranged on the outer surface of the catheter body and used for generating radiofrequency currents, wherein the localization sensor generates a current signal in response to a localization magnetic field of a space where the localization sensor is located, and outputs the current signal to a control system outside the radiofrequency ablation catheter, so as to enable the control system to determine a position of the radiofrequency ablation catheter. The radiofrequency ablation catheter and system provided by the embodiments of the present application may help the ablation electrodes to be placed in the lesion positions more accurately.
