Aiming at the failure of the rearend of the crankshaft flange oil cover and combined with nanocomposite brushing electroplating technology, its remanufacturing machine tool was designed. Batch and automatic crankshaft remanufacturing was achieved. The machine tool was consisted of grinding device, brushing plating device and plating solution circulating device. With a handle in the brush plating device, the distance and the pressure between the plating pen and the workpiece were adjusted. The pressure between the brush head and the workpiece could be monitored by the builtin pressure sensor of the brush handle, so as to regulate the plating pen, and to provide the best parameter for repairing the crankshaft rearend flange oil cover. In addition, the machine control system was divided into loading and unloading module, grinding module and brush plating module. By using programmable logical controller (PLC) as the controller of the system, the logic control, timing, counting and other functions were realized. The machine tool is simple in operation, highly automated and can repair cranks with different sizes.