The invention discloses a power transmission line speed regulation rope ladder climbing device. A direct current speed regulation motor (9) is connected with a gearbox (8); two nylon rollers (5) are respectively fixed on two output shafts of the gearbox (8); the upper ends of two insulating ropes (3) are vertically hung on a wire (1) by insulating rope racks (2); after passing through a thread hole (11) on an upper mounting plate (12), each insulating rope (3) bypasses the nylon roller (5) at the corresponding position by 4 to 6 circles, and then passes through a thread hole (11) on a lower mounting plate (13); the lower end of each insulating rope (3) is fixed on the ground by a ground anchor (7) and a tensioning rope (6); and a control unit (10) comprises a power supply switch (14), a reversing switch (15) and a speed regulation switch (16). According to the power transmission line speed regulation rope ladder climbing device disclosed by the invention, a safety requirement and a comprehensive quality requirement for an operator to enter an operation site are reduced, and a novel method for an overhaul operation of a power transmission line is created.