A catheter applicable in endovascular radiofrequency ablation in blood vessels such as renal arteries. From the proximal end to the distal end, the catheter comprises: a control handle (5), a main body segment (1), a bendable segment (2), and an electrode (4), where a pull wire (10) runs through the interior of the catheter and is controlled by the control handle (5). The catheter also comprises a straight end-segment (3). The electrode (4) is fixed onto the straight end-segment (3). The pull wire (10) is fixed at one end thereof to the distal end of the straight end-segment (3), while the pull wire (10) is arranged in that, along the axis of the catheter, the pull wire (10) extends on different sides respectively in the straight end-segment (3) and in the bendable segment (2). The catheter allows for adaptation to different renal artery inner diameters, for enhanced wall-attaching effect of the electrode, while the catheter is simple to operate, safe, and reliable for use in sympathetic nerve radiofrequency ablation of the renal arteries.
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