The invention discloses an anti-high-altitude-falling flexible ladder. The anti-high-altitude-falling flexible ladder comprises lead pulleys, an anti-high-altitude-falling mechanism, a flexible ladder main body, an operating backrest and flexible ladder hanging points, wherein the lead pulleys are arranged on first ends of the flexible ladder main body, and the flexible ladder hanging points are arranged on the second ends of the flexible ladder main body; the operating backrest is fixed on the flexible ladder main body between the first ends and the second ends; the anti-high-altitude-falling mechanism comprises a protecting rope and two rope clips; the two rope clips are respectively arranged on two sides of the flexible ladder main body, and the protecting rope penetrates through the two rope clips; after the body of an operator is suddenly separated from the flexible ladder main body, the protecting rope is rapidly locked by the rope clips when the stretching speed of the protecting rope is too high so as to prevent the operator from continuously falling. The anti-high-altitude-falling flexible ladder has the advantages that protecting rope can be rapidly locked when the operator falls, so that the falling of the operator is avoided, and the personal safety of the operator is protected.