Magnetorheological polishing (MRP) is a versatile technique that can be used for a variety of materials, including metals, ceramics, and glass. It can be used to remove surface defects, such as scratches and pits, as well as to improve surface roughness and flatness. MR polishing can also be used to selectively polish certain areas of a workpiece, allowing for the creation of complex shapes. In this study, the influence of magnetic field and spindle speed on the material removal rate and surface roughness of SKD11 workpiece was carried out. When a magnetic field is created, the rheological properties of the MRP fluid will change during the machining process. Consequently, both the viscosity and shear yield stress of the MRP fluid are significantly enhanced under the influence of an electric current. Experimental findings demonstrate that the electric current greatly impacts the surface roughness of the workpiece. Specifically, the surface roughness of a ∅30 mm workpiece quickly decreases from Ra = 140 nm to Ra = 21 nm. Additionally, the material removal rate (MRR) achieves a maximum value of 0.72 μm/h at a spindle speed of 1750 rpm.