Magneto-rheological damper with unidirectional damping property

The invention discloses a magneto-rheological damper with unidirectional damping property, and relates to the technical field of devices for adjusting damping property by changing fluid viscosity. The magneto-rheological damper comprises a damping cylinder, a unidirectional damping piston assembly, a coil assembly, a piston rod and magneto-rheological liquid, wherein the unidirectional damping piston assembly comprises a damping piston, a spring sheet and a gasket; a first annular through hole and a second annular through hole are formed in the damping piston; a magneto-rheological fluid passage is arranged on the coil assembly and is communicated with the first annular through hole, and the coil assembly does not cover the second annular through hole. The magneto-rheological damper has the advantages that when the damping piston moves up, the spring sheet seals the second annular through hole, the magneto-rheological fluid only passes through the magneto-rheological liquid passage under the action of a magnetic field, and the damping force can be adjusted by adjusting the intensity of the magnetic field; when the damping piston moves down, the second annular through hole is opened under the action of no magnetic field, and the produced damping force is little, so that the unidirectional damping property of the magneto-rheological damper is realized.