Aiming at the uneven problem of the drum type magnetorheological transmission device with uniform gap magnetic field strength, a uniform gap magnetorheological transmission device is put forward and improved to design a wedge gap, cylindrical wedge gap magnetorheological transmission device, and deduced the theoretical torque formula of cylindrical wedge gap magnetorheological transmission device. The magnetic field was simulated with finite element (FE), comparison between uniform gap and wedge gap was made, and analyzed the influence of wedge angle and the width of the gap magnetic induction intensity on gap distribution uniformity and the output torque. The discussion results show that when the other conditions remain unchanged, when the wedge angle is about 1074 degrees, the magnetic induction intensity in the working gap has the most uniform distribution. At the same time, the wedge angle is smaller, the output torque is large, and uniform gap has maximum output torque.