Abstract: In order to meet the needs of the long-distance oriental drilling for coal mine drilling equipment, the oriental device of friction plate was designed in tunn el drill rig through the friction parameter calculation and structure design. The braking device in the process of work stress field was simulated by the finite element sim ulation, and achieved the stress distribution of the device's active and passive friction plate and torque values. The reliability of oriental device was proved by laborator y simulation experiment and field industrial experiment. The friction coefficient in the model was modified by the laboratory simulation experiment result. This verificatio n friction coefficient could provide the theoretical basis for oriental device structure design. The field experiment results showed that the design of oriental device could satisfy the braking requirements, and the tool face angle could be accurately controlled. The research results provided guarantee of long-distance directional drilling Co nstruction in coal mine.