The present invention relates to an ablation catheter (1) for the ablation of tissues comprising:- a telescopic tubular body (4) in turn comprising an external tubular body (4a) and an internal tubular body (4b) concentric with each other, and a rod-like guiding element (5) at least partly housed in the internal tubular body (4b) with at least one free end (5a) protruding from the internal tubular body (4b) in correspondence with a distal end of the telescopic body (4)； - a positioning head (2, 2", 2 "', 2°, 2*, 2^) and an ablation head (3) in correspondence with the distal end of the telescopic body (4), the positioning head (2,2'',2''',2',2*,2^) being situated in the proximity of the free end (5a) of the rod-like guide, and the ablation head (3) in the proximity of the positioning head (2, 2'', 2''', 2°, 2*, 2^), in a remote position with respect to the free end (5a)； - a control handpiece at a proximal end of the telescopic body (4) coupled with the guiding element (5), the ablation head (3), the positioning head (2, 2", 2"', 2°, 2*, 2^) and the telescopic tubular body (4)； wherein the ablation head (3) comprises at least two ablation elements or petals (3a) that can be moved from a rest position in which they are housed in the external tubular body (4a) and an operating position in which they protrude from the external tubular body (4a) like a petal； wherein each of the ablation elements or petals (3a) comprises: - a continuous ablation electrode (3b) which extends without interruption over a circumferential peripheral portion of each petal (3a), substantially along an arc of circumference having a longitudinal axis of the rod-like guiding element (5) as its centre； - two side portions (3c) of the petal (3a), each connected to an end of the ablation electrode (3b), in correspondence with a curved section, the side portions (3c) and the ablation electrode (3b) being integral with each other, formed by means of the same folded metallic conductor, - each ablation p
