Safety ladder cage convenient to assemble

The invention relates to a safety ladder cage convenient to assemble. The safety ladder cage comprises a bottom-layer platform, a top-layer cover plate, a connecting platform, a plurality of stand columns, a plurality of safety ladders and a protective net, wherein the protective net is enclosed between every two adjacent stand columns; each of the bottom-layer platform and the connecting platform comprises a frame and a bearing plate mounted at one end of the frame, the protective net is hinged to the frame and fixed to the frame of the upper-layer connecting platform through a locking assembly, and the safety ladder is connected between every two adjacent bearing plates; bases and fixing pieces are fixed to the four corners of the bottom-layer platform, limiting inserting-connecting assemblies are installed at the four corners of the connecting platform, and every two vertically-adjacent stand columns are connected through the corresponding limiting inserting-connecting assemblies; the two ends of the inser