The insufficiency of bolt pre tightening force is a striking problem that damages supporting effect and roof safety in coal mine roadway. Based on the principle of rolling friction, a new bolt pre tightening device was put forward, whose structure and corresponding methods of use were both introduced. The mechanical model was established that of interaction between bolt nut and shim plate, calculation formula of friction torque was govten in the tightening process of bolt nut, and the calculating expression of friction torque between the nut and the pad with the use of ‘antifriction device’ was figured out. Based on the relation between bolt tightening torque and bolt pre tightening force, the effect was analyzed related to the improvement of pre tightening force when utilizing bolt pre tightening device which hinges on the principle of rolling friction. The whole process demonstrated the feasibility of research and development of this device. The bolt pre tightening device was made, and the pre tightening experiment was conducted on the platform for research on a bolt. The result shows that the device improve the bolt pre tightening force, which increase with the margin of bolt tightening torque. Similarly, it achieves good effects in the field trial.