Polishing device based on dynamic magnetic field, polishing method and application

The invention relates to the technical field of ultra-precision machining, and specifically discloses a polishing device based on a dynamic magnetic field, a polishing method and application. The polishing device based on the dynamic magnetic field comprises a magnetorheological polishing assembly and a magnetic field generating assembly; the magnetorheological polishing assembly comprises a polishing disc; a plurality of V-shaped structures are arranged on the surface of the polishing disc in the circumferential direction and used for increasing the hydrodynamic pressure in the polishing process; and a recovery groove is formed in the portion, on the outer side of the polishing disc, of a workbench. According to the embodiment of the invention, the up-and-down V-shaped structures are arranged on the polishing disc, so that a hydrodynamic pressure film is formed when magnetorheological fluid flows through; when passing through the magnetic field generating assembly, magnetorheologicalfluid is changed into a s