The invention provides a radiofrequency ablation catheter with a segment-shaped support structure. The radiofrequency ablation catheter comprises the segment-shaped support structure which is formed by the same hollow tube through machining; the segment-shaped support comprises a plurality of support wires and one connecting tube or two connecting tubes; the support wires are distributed in a circular shape around the center axis; the connecting tube or the connecting tubes and the support wires are integrated into a whole; the length direction of every support wire extends along the length direction of the hollow tube; two ends of every support wire are gathered together to form a far end and a near end of the segment-shaped support respectively; one or more than one electrode is arranged in the middle section of every support wire; the middle section of the segment-shaped support comprises the retraction state and the extension state. The segment-shaped support which is arranged in the radiofrequency ablation catheter is formed by the same tube through machining, the extensible property is good, the arrangement form of the plurality of electrodes meets the specific requirements during extension wall-sticking, and accordingly the coverage is good for different thicknesses of blood vessels and bent blood vessels.