In view of the existing safety problems that occurred during the lifting rope to replace for the working condition of overloading deep well, a kind of lifting rope chain continuous replacement device is put forward based on the mechanism of “Pipe forming”. The device of the threedimensional (3D) entity model was established and its dynamic simulation analysis was carried out. The simulation results show that at lifting rope replacement, the lifting cable vibration amplitude is proportional to the change of line speed, and when the chain pitch unchanged the sprocket is inversely proportional to the number of teeth. But the lock rope agency is set up to a certain extent reduce the effects of the chain polygon effect, and replace the rope device under different operation condition are stable in operation and small impact. According to the simulation conclusion making prototype and experimental study, the test results and simulation results are consistent, which verifies the rope replacement device can always be achieved under different load conditions run impact the effect of small, high efficiency and high safety.