Fully folding type cage ladder

The utility model discloses a fully folding type cage ladder, which comprises two columns of ladder legs. A plurality of connecting rods are connected onto both columns of ladder legs respectively. The other end of each connecting rod is provided with a pin hole connected with a petroleum drilling machine. A plurality of stepping rods are sequentially welded between the two columns of ladder legs at intervals. A connecting limit lug board is respectively connected to the positions at the same height of the stepping rod on the two columns of ladder legs, each pair of connecting lug boards is connected with a group of protecting rings through a first pin shaft, and each protecting ring is hinged to a pull rod through a second pin shaft. The fully folding type cage ladder achieves fully folding of the protecting rings during transportation and storage process of the petroleum drilling machine and reduces transportation times of vehicles and storage space to the largest extent. The fully folding type cage ladder