The utility model discloses an internally piloting auto -lock ladder head, including hanging hole base (1) and hanging hole (5), link to each other through length adjustable rod spare between hanging hole base (1), link to each other through chain (2) between hanging hole (5). The utility model discloses pole setting interval adjusting device has prevented to come the potential safety hazard because of the deformation band that load led to the fact about having increased on original ladder first basis, and the cable who increases on the hanging hole is then have one protection for the safety hook has increased.