according to the requirement of designing the magnetic sealing drive, the magnetic sealing drive torque design and calculation is completed. It is also analyzed the magnetic circuit and the whole structure of the drive. The matching problem of magnet thickness and arc length of magnetic pole surface is analyzed. The research also includes the method to calculate torque of combination of push pull magnetic circuit and method of its power matching calculation and correction. The magnetic sealing drive is tested and the results show that the design of the magnetic sealing drive complies with the design requirements.