Long-life universal joint capable of realizing exhausting and free of oil leakage

The invention discloses a long-life universal joint capable of realizing exhausting and free of oil leakage. Oil seals are arranged between outer rings and shaft journals of bearings. Each oil seal isprovided with a framework, an exhaust groove and a seal lip, wherein the framework is in the L shape and is installed in a manner of being matched with the outer ring, and the seal lip arranged at the bottom of the oil seal is circular and convex. The seal fit surfaces of the oil seals and a universal joint body are provided with arc grooves, the seal lips are matched with the arc grooves to formbuckle type connection. The exhaust grooves communicating the interiors of the bearings with the outside world are formed in the oil seals and used for discharging the gas generated in the bearings to the outside world. By optimizing the structural design of a part of parts of the universal joint, the development cycle can be shortened and the manufacturing cost can be reduced. Because of the design of the exhausting buck