Aiming at the problem of poor safety and low efficiency of artificial anchor cabling in underground roadway support, the cable rig has been designed to automatically hit the manipulator arm.On the basis of the actual size of the mechanical arm and the kinematics theory of robot arm, this paper established the dynamic equations of the mechanical arm of the cable rig.Owing to the relative complexity of the mechanical arm of the bolt drill, the mechanical arm has a great influence on the stability of the whole machine.The virtual prototype model of the machine arm was introduced into multi-body the dynamics software ADAMS for dynamics simulation, the drill stand at a constant external load was observed to judge, by adjusting the schedule between the two oil cylinders, whether the drill stand can realize all the working position in the whole working space, to find the worst working condition for anchoring in different poses, and to check the working conditions of oil cylinder force change and the stress state of telescopic boom.At 3 sin the simulation time, the mechanical arm lifting oil cylinder force is over the allowable ultimate tensile stress, 1.9×105 N.Therefore, Ansys Work Bench was used to check the torsional static strength for the reverse telescopic arm with strong torque, so as to ensure the dynamic demand of mechanical arm.This research provides some theoretical foundation and practical experience for future \"industrial mechanical arm\" dynamics analysis.