The utility model discloses a folding ladder for transmission line operation of being qualified for next round of competitions. Its structure as follows: the adjacent one end of front and back ladder post is articulated mutually, and the adaptation position of front and back ladder post evenly is equipped with a plurality of ladder crossbeams respectively, the other end of preceding ladder post is equipped with hangs wire hook, the other end of back ladder post is equipped with fixing device, still is equipped with the arm -tie between the ladder post of front and back, and the one end of this arm -tie and the adaptation position of a ladder post link firmly, and the other end of arm -tie passes through spring catch swing joint with the adaptation position of another ladder post, and still is equipped with a plurality of ladder lockholes that match with spring catch on this ladder post. The utility model discloses a machinery folding function, the activity duration on the shaft tower that can significantly reduce, the operation personnel that conveniently are qualified for the next round of competitions overhaul, guarantee that aerial work personnel health is balanced, reduce operation personnel intensity of labour, improve work efficiency, guarantee the operation personnel safety of being under construction, the simple installation, convenient to carry, the rapid operation, low cost is very easily in using widely in transmission of electricity production specialty.