Abstract: Low frequency torsional vibration, which not only reduces the power transmission efficiency of shaft structures but also threatens the operational safety of them, has become a research hotspot in the field of low-frequency vibration control. In response to the problems of contact friction and difficulty in matching positive and negative stiffness elements of the quasi-zero stiffness torsional isolators applied to low-frequency torsional vibrations of shafts, a magnetic transmission torsion isolator designed via non-contact magnetic transmission approach is proposed for low frequency torsional vibration suppression of shafts. The magnetic conductivity model of the magnetic gear of the magnetic transmission torsion isolator is derived using Ohm's law magnetic circuit, and then the relationship between the torque and angular displacement of the isolator is also established. The nonlinear characteristics between torque and angular displacement are further demonstrated by finite element analysis. Moreover, the low frequency torsional isolation performance of the isolator is studied. Refer to the theoretical results, the magnetic transmission torsion isolator is manufactured and a test rig of the isolator is developed. The experimental results show that the proposed magnetic transmission torsion isolator can effectively isolate the low frequency torsion vibration of the shafts during the power transmission. Furthermore, the isolator still has the wonderful low frequency torsion isolation performance when the inside and outside magnetic gear are misaligned along the axial direction.