Foldable safety ladder

A foldable safety ladder is provided with a safety ladder frame composed of four stand columns, inserting grooves are formed in the top ends of the stand columns, the bottom ends of the stand columnsare cylindrical, four ladder sections are arranged in the frame, each ladder section is composed of an inclined ladder, an upper slow step table and a lower slow step table, and the upper ends and thelower ends of the inclined ladders are connected with the upper slow step tables and the lower slow step tables respectively. The upper slow walking platform of the lower stair section is overlappedwith the lower slow walking platform of the upper stair section to form a layer of walking platform; two protective doors are arranged on one side of the walking board in a hinged door mode, when thetwo protective doors are closed, the two protective doors are fixed and locked through plug pins, a detachable cross rod is arranged below the protective doors and between the two stand columns, the cross rod is fixedly connecte