The invention discloses a steel wire rope replacing method of a deep well multi-rope friction type elevator. The steel wire rope replacing method adopts a rope adjusting device, through a motor and aspeed reducer, power is provided for elevating and descending of a new steel wire rope, an old steel wire rope and an elevator cage on the steel wire ropes, the speed is adjustable, on the other hand,large brake force is provided for the new and old steel wire ropes, the rope replacing process is safe and stable, and the method is particularly suitable for rope replacing operation of the deep well multi-rope friction type elevator. In addition, through a brake device, the new steel wire rope and the old steel wire rope can be directly and safely braked, system safety is ensured, the steel wire rope replacing method is adopted, multiple steel wire ropes can be synchronously replaced, rope replacing efficiency is greatly improved, and the rope replacing time is saved.