A supporting device on a supporting pole, in particular for at least one wire for containing row, which includes wire-holding element formed by shaped thread-like body comprising resting portion adapted to be removably rested, in use, on first portion of outer surface of supporting pole and supporting means for containment wire extending from opposite sides with respect to resting portion, and pulling and anchoring element formed by shaped thread-like body including engagement portion adapted to interact, in use, with second portion of outer surface of supporting pole opposite to first portion and elastically deformable anchoring means which extend substantially perpendicularly and from opposite sides with respect to engagement portion and adapted to cooperate with second portion of outer surface of supporting pole.