Abstract: The invention relates to a solar tracker characterized by having photovoltaic panels arranged in spaced rows at different levels and two slopes, favouring their ventilation and the expansion of the frame; the panels being fixed by means of yokes and clips to a support (3) anchored to the H-shaped frame (4) resting on swivelling supports of a tower having little height supporting the entire structure, its tilt being variable by means of a tension device, the side longitudinal beams (4a) being extendible to house more rows of panels (1) since the remaining structural components, tower, bearings, column and base have been oversized for that purpose.