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A kind of magnetorheological damper using permanent magnetic seal ring, including cylinder assembly, piston assembly;Cylinder assembly includes working cylinder, working cylinder one end is sealed through sealing guide mechanism and is sealed with piston rod;Working cylinder other end is provided with gas compensation assembly;Piston assembly includes piston rod, and piston rod is connected with piston head assembly;Piston head assembly includes piston sleeve, and iron core is arranged in piston sleeve, and the left and right ends of iron core are correspondingly clamped with upper end cover and lower end cover and are combined into an integral whole with piston sleeve;Excitation coil is provided in piston sleeve and located outside iron core, and excitation coil controls the damping performance of magnetorheological fluid.The magnetorheological damper using permanent magnetic seal ring provided by the application can effectively reduce the leakage of magnetorheological fluid.