A device (110) and a method for locally repairing or reinforcing an elongate body (100), said device (110) being intended for winding one or a plurality of layers of pre-impregnated polymerizable strip around the elongate body (100), said device (110) comprising:—releasable means (112, 113) of attachment around the elongate body (100),—means for the rotational movement of support structure (125) around the means (112, 113) of attachment,—means for the longitudinal movement of a spool (135) of a pre-impregnated polymerizable strip relative to the support structure (125), said support (125) comprising means for limiting the movement of the spool to a predetermined path, said spool (135) being unwindable when it is subjected to a given tension,—means for bringing the spool (135) into rotational and translational movement around the elongate body (100), causing the pre-impregnated polymerizable strip to be wound around said body.