In the complex working environment of underground coal mine, the overhead passenger device is the key facility to ensure the efficient and safe movement of personnel, and its operation safety is very important. This paper takes two overhead passenger devices installed underground in Shanxi Pingshu Coal Industry Co., Ltd.as the research object, and analyzes the problem that the steel wire rope is easy to fall off from the rope groove in the actual operation. Through field investigation and causal analysis, it is determined that the main causes of wire rope shedding include that the bracket is not in a straight line, the rubber ring of the tug is seriously worn, and the rotation and torsion of the wire rope itself. In order to solve these problems, a small anti-off rope device is designed, which is installed next to the tugboat of the overhead passenger device, and solves the problem of rope shedding rope groove. The practical application results show that the device effectively reduces the failure rate of the overhead passenger device, eliminates the safety hazards, improves the production efficiency, and has low cost, convenient installation and remarkable economic benefits.