Abstract: Mine hoisting pulley has an important role of guidance and support in hoist system.However, under the work environment with overload, high altitude, dynamic load and changeable, there are some affecting factors, such as not synchronized in the rope cycle, and unequal line, which make the rope groove frayed, and cause secondary damage to new ropes, and endanger the service life of rope and pulley. Therefore, this paper establishes and analyzes the mathematical model with eccentric error and position error, and obtains the relationship between the error of feed and some parameters, such as feeding, the size of original rope, the eccentric error, the height of cutting tools to install platform, the original rope size and angle of machine tool.This paper determines the optimal design parameters with the distance from the turning device installation plane to the pulley axis is 1 m, the distance from cutting head to the installation plane is 0.6 m, and the angle is 60°. This paper uses two axes linkage and three-dimensional drive system to design the device ontology based on “servo motor + ball screw pair”, and uses the integral frame positioning to design the hanging bracket.The hanging bracket fixes the ontology on the lower triangular position of the head sheave platform.The static and dynamic simulation analysis show that the designs of device body and bracket are feasible.The experimental research shows that the device can better turn the rope pulley groove, and the radius of the rope after turning is 1648.05 mm, and the position of the circumference is 10.355 m, and the turning accuracy reaches 10^-3.The ropes have good consistency, and eliminates the wear peak.