Section of cable tray that comprises: longitudinal bars and transverse bars (2, 6, 7, 17) joined forming a channel with a base and two side walls, said section comprising a front end that has a second-to-last transverse bar and a last transverse bar, and a rear end with a last transverse bar, and an anchoring element situated on each of its walls and/or base of the front end, with the shape of a fold bar, provided with a fold at one end and which has, at an end opposite the fold, two extensions that are parallel to each other and are welded to the wall of the front end of the tray section, specifically welded to the transverse bars (6, 7), said extensions projecting into portions that go beyond the last transverse bar, which are followed by first bends that in turn are followed by inward portions towards the interior of the tray that are followed by second turns, which in turn are followed by branches that comprise a straight end portion ending in the fold, which are intended to fit into the wall and/or base of the following tray section, to which they join, there being a gap defined between the bend turn, the inward portion and the last transverse bar intended to receive the last transverse bar of the rear end of the following tray section being joined to, characterized in that each branch further comprises a straight intermediate portion that is located between the second bend and the end portion, with a different inclination than that of the end portion, defining a third bend between the intermediate portion and the end portion and wherein the first bend is followed by an inward portion entering the tray that is perpendicular to the transverse bar. longitudinal bars and transverse bars (2, 6, 7, 17) joined forming a channel with a base and two side walls, said section comprising a front end that has a second-to-last transverse bar and a last transverse bar, and a rear end with a last transverse bar, and an anchoring element situated on each of its walls and/or base of the front end, with the shape of a fold bar, provided with a fold at one end and which has, at an end opposite the fold, two extensions that are parallel to each other and are welded to the wall of the front end of the tray section, specifically welded to the transverse bars (6, 7), said extensions projecting into portions that go beyond the last transverse bar, which are followed by first bends that in turn are followed by inward portions towards the interior of the tray that are followed by second turns, which in turn are followed by branches that comprise a straight end portion ending in the fold, which are intended to fit into the wall and/or base of the following tray section, to which they join, there being a gap defined between the bend turn, the inward portion and the last transverse bar intended to receive the last transverse bar of the rear end of the following tray section being joined to, characterized in that each branch further comprises a straight intermediate portion that is located between the second bend and the end portion, with a different inclination than that of the end portion, defining a third bend between the intermediate portion and the end portion and wherein the first bend is followed by an inward portion entering the tray that is perpendicular to the transverse bar.