Abstract: A descending device hanging structure adapted to hang a descending device on a window for helping a person to escape from a danger is disclosed to include a first rod member for the hanging of the safety hook of a descending device, a second rod member for supporting the safety hook of the descending device to be hung to the first rod member, and a plurality of fastening devices respectively provided at the first rod member and adapted to secure the second rod member to the first rod member after the first rod member and the second rod member have been respectively transversely stopped at the inner and outer sides of a window.