Roof falling-preventing supporting structure for large-span mining roadway for fully-mechanized caving of ultra-thick coal seam

The invention discloses a roof falling-preventing supporting structure for a large-span mining roadway for fully-mechanized caving of an ultra-thick coal seam. The roof falling-preventing supporting structure is characterized in that a roof support is arranged in the roadway, specifically, a roof metal net is laid on the roof, and roof steel strips are also arranged on the roof; span reduction anchor cables, stay anchor cables and should pit anchor rods are arranged on the roof through the roof steel strips, and the vertical distance from the rooting point of each stay anchor cable in a coal body on the roof to the lateral wall surface of the side where the rooting point is located is not smaller than 1500 mm; and a lateral wall support is arranged in the lateral wall, specifically, ladder beams are arranged on a lateral wall metal net in the longitudinal direction at intervals, and pitching-up anchor rods, pitching-down anchor rods and horizontal anchor rods are arranged through the ladder beams correspondin