A safety rope blocker having a body provided with a through hole for the passage of an anchoring ring and a curved groove opening into the through hole for the passage of the safety rope through the anchoring ring, the body being able to rotate between a blocking position in which the safety rope is blocked by the anchoring ring against the body and a releasing position in which the safety rope slide in the curved groove, the groove includes a deviation element to allow, in the releasing position, the safety rope to slide in the curved groove and outside the through hole.