A movable high-building escape ladder comprises a support main body, a main platform which can stretch out of a room and a climbing ladder which is connected between the support main body and the main platform and used for allowing people to climb to the main platform. The support main body comprises an upper support plate abutting against the indoor top face, a lower support plate abutting against the indoor ground and main support rods connected between the upper support plate and the lower support plate; the main platform is arranged on the main support rods in a vertically movable mode, and ladders can be erected on the main platform. The high-building escape ladder is equivalent to erecting a platform for escape in the air, people can erect the ladder through the platform to save people located on the upper floor or the closer next floor, and the high-building escape ladder also can be used for allowing people to escape to the upper floor or the lower floor or the closer next floor.