Disclosed are a radio-frequency ablation catheter having a spiral structure and device thereof. The radio-frequency ablation catheter has an elongated catheter body. A spiral electrode support is arranged at the front end of the catheter body. Multiple electrodes are arranged on the electrode support. A control handle is arranged at the rear end of the catheter body. Wall-attachment adjusting wires having various structures can be arranged in the radio-frequency ablation catheter, so that the radio-frequency ablation catheter having a spiral structure can be adapted to target vessels of different diameters, and so that the electrodes on the electrode support have a good wall-attachment state.