A solar energy harvesting device, including several single-axis solar trackers (S1-S5), each of said single-axis solar trackers (S1-S5) comprising an elongated structure on which there are installed in a co-planar manner a plurality of photovoltaic panels , a tubular rotating shaft fixed to a lower side of said structure and arranged along a longitudinal direction thereof, a plurality of support feet distributed along the structure , each support foot having an upper end which supports a bearing coupled to said tubular rotating shaft and a lower end anchored to the ground, and a drive motor operatively connected for rotating the tubular rotating shaft together with the structure and said photovoltaic panels according to the relative movements of the Sun, the tubular rotating shafts of the several single-axis solar trackers (SI-S5) being coaxially aligned, further including positive and negative wires conducting electrical energy generated by the photovoltaic panels are connected in series in the different single-axis solar trackers (S1-S5); characterized in that : - said positive and negative wires are inserted into the tubular shafts through open ends thereof and are housed inside one or more of the tubular rotating shafts ; - said positive and negative wires emerge from an open final end of the tubular rotating shaft of one of the of the single-axis solar trackers (S1-S5) and are inserted into the tubular rotating shaft of another adjacent single-axis solar tracker (S1-S5) through an open initial end of the corresponding tubular rotating shaft ; - the positive and negative wires of each single-axis solar tracker (S1-S5) are gradually added to the positive and negative wires of successive single-axis solar trackers (S1-S5) and are connected to a junction box located in a final single-axis solar tracker (S5); and - the positive and negative wires are conducted from said open final end of one of the tubular rotating shafts to said open initial end of the tubular rotating shaft of another adjacent single-axis solar tracker (S1-S5) inside a protective sleeve ; wherein open ends of two adjacent tubular rotating shafts are coaxially fixed to a rotating drive wheel of a drive device by tubular connecting elements , wherein said rotating drive wheel has a central opening , and wherein the positive and negative wires go from one to the other of the open ends of the tubular rotating shafts through the inside of said tubular connecting elements and through said central opening of the rotating drive wheel . - said positive and negative wires are inserted into the tubular shafts through open ends thereof and are housed inside one or more of the tubular rotating shafts ; - said positive and negative wires emerge from an open final end of the tubular rotating shaft of one of the of the single-axis solar trackers (S1-S5) and are inserted into the tubular rotating shaft of another adjacent single-axis solar tracker (S1-S5) through an open initial end of the corresponding tubular rotating shaft ; - the positive and negative wires of each single-axis solar tracker (S1-S5) are gradually added to the positive and negative wires of successive single-axis solar trackers (S1-S5) and are connected to a junction box located in a final single-axis solar tracker (S5); and - the positive and negative wires are conducted from said open final end of one of the tubular rotating shafts to said open initial end of the tubular rotating shaft of another adjacent single-axis solar tracker (S1-S5) inside a protective sleeve ; <EOS>