Compared with the ordinary elastic loaded end face seal, the main advantage of the magnetic end face seal is that the structure element is small, compact and easy to install. By replacing the elastic force of the elastic element with magnetic force, it overcomes the problem that the contact load changes greatly by the influence of manufacture, installation error and axial displacement in the working process. Contact load of sealed interface. It can be designed to be smaller (only 25% 150 of ordinary spring-loaded end-face seals) and evenly distributed. Therefore, the magnetic face sealing device working ability (temperature, pressure difference) higher, reliable, low wear and long life.