The invention discloses a 110kV power transmission line rope ladder tightener. The 110kV power transmission line rope ladder tightener comprises a buckle ring, a shell, a rotating mechanism and a braking mechanism; the buckle ring is fixed to the shell; a first fixed shaft is arranged in the shell; the rotating mechanism is mounted on the first fixed shell; the rotating mechanism comprises ratchet-gear wheels; a second fixed shaft is arranged above the first fixed shaft; the braking mechanism is mounted on the second fixed shaft; the braking mechanism comprises pawls; the pawls are matched with the ratchet-gear wheels; a rope inlet is formed in the side wall of the shell; guide plates are arranged above and below the rope inlet; the tail ends of the guide plates are positioned between the rotating mechanism and the braking mechanism. The 110kV power transmission line rope ladder tightener has the advantages that a rope ladder mounting rope which extends into the rope inlet can be positioned between the rotating mechanism and the braking mechanism by starting the braking mechanism; after the braking mechanism is shutdown, the rope ladder mounting rope can be clamped; after the rope ladder mounting rope is clamped, the rope ladder mounting rope is tightened by moving a handle and rotating the ratchet-gear wheels, so that the mounting of the rope ladder is completed; the 110kV power transmission line rope ladder tightener is convenient and efficient, and is little in time consumption.