The lubricating system is the critical segment to ensure the good operation of bearing subsystem and the whole mill system. To keep pace with the advanced domestic and outdoors technologies, it is emergent to design and develop the mechatronic test rig of mill oil-film bearing. According to the detailed design parameters and design principles of lubricating system, its main modules and the lubricating mechanism are designed and implemented. The according 2D drawings and 3D solid models are successfully established. Consequently, the prototype is developed, and runs well in practical tests on mechanical parameters of mill bearing. Moreover, some further improvements are also made to better the performances of lubricating system.