In view of the disadvantage of small transmission torque of magnetorheological pure shear transmission, a magnetorheological fluid（MRF） transmission method based on electromagnetic extrusion was proposed. The magnetic field was simulated and analyzed by using Ansoft Maxwell software, and the shear yield stress and electromagnetic force on the pressure plate under different input current were obtained. Based on the extrusion strengthening effect of MRF, the shear yield stress and torque of MRF were analyzed after the pressure plate extrusion strengthening. The results show that the shear yield stress of the MRF increases when the MRF is extruded, so the torque transmitted by the device increases; the torque transferred by MRF in extrusion shear mode is 1.53 times of that in pure shear mode.