Disclosed is a device for fastening and adjusting the carrying wires on a row of plants, in particular grape vines, in order to make it possible to manage the entire cultivation system more rationally during the phases of growth, harvest (e.g. grape harvest) and trimming. The device makes both manual and mechanized operation (i.e. fastening and adjustment of wires) simpler and more functional The device comprises, for each row, a pair of head poles and a plurality of intermediate poles between which intermediate poles are tensioned fixed or movable carrying wires and movable containment wires, said containment wires and said carrying wires being movable in the vertical direction, wherein each head pole is embedded in the ground in a substantially vertical position and is associated to an additional pole planted in a vertical position by means of a first structural element, positioned at the top ends of said head pole and of the corresponding vertical pole, each additional vertical pole also forming a guide for shifting means to which are connected said containment wires.
