Lifelong maintenance-free magnetic cross shaft universal joint

The invention discloses a lifelong maintenance-free magnetic cross shaft universal joint. The universal joint mainly comprises a cross shaft, annular magnetizers, bearings, outer rings, strip-shaped magnetizers and dustproof covers, wherein four shaft heads of the cross shaft are fixedly connected with the annular magnetizer respectively; the outer part of each annular magnetizer is fixedly connected with the bearing; each bearing comprises the outer ring, the strip-shaped magnetizer and the dustproof cover; a plurality of strip-shaped magnetizers are embedded in the inner walls of the outerrings; the dustproof covers are fixedly connected with the opening parts of the outer rings. When a vehicle ignites and is started, mutually exclusive strong magnetic fields are generated by the innerwalls formed by the outer rings and the strip-shaped magnetizers and the outer walls of the annular magnetizers. The universal joint has the beneficial effects that under the action of the magnetic fields, the annular magnetiz