The invention discloses a combined safety ladder cage. The combined safety ladder cage comprises at least two safety ladder units laminated and connected in sequence; the at least two safety ladder units laminated and connected in sequence are connected in the vertical direction; each safety ladder unit comprises a rectangular frame formed by splicing two longitudinal beams and two cross beams through connecting heads; vertical beams vertically connected with the connecting heads are arranged in the connecting places between the longitudinal beams and the cross beams; the connecting heads are used for connecting two adjacent safety ladder units; transverse plates are arranged on one sides, near one cross beam, of the rectangular frames; inclined ladders are arranged along the edges of the transverse plates near the longitudinal beam on one side; first protective nets are arranged on the side surfaces, formed by the cross beams and the vertical beams, of the safety ladder units; and two second protective nets are arranged on the side surfaces, formed by the longitudinal beams and the vertical beams, of the safety ladder units side by side. The ladder cage is high in structural strength, excellent in overall stability and proper in pedestrian ladder width; pedestrians can freely stagger to get on and off a pedestrian ladder; and tools are carried more conveniently.