Ultralow-temperature fluid rotating joint

The utility model discloses an ultralow-temperature fluid rotating joint, which relates to the technical field of low-temperature fluid loading and unloading components in the petrochemical industry and mainly comprises an inner ring, an outer ring, a left flange, a right flange and a main sealing ring. A specific structure is formed by a main chamfer in the main sealing ring, a second pouring angle of the inner ring and a first pouring angle of the main sealing groove. When the main sealing ring works normally, a good protection effect is achieved: firstly, the first pouring angle of the mainsealing groove can prevent the main sealing ring from deforming due to long-term work; and the second pouring angle of the inner ring and the main sealing groove form a communicating body, so that pressurization in the groove is prevented. And thirdly, the main chamfer in the main sealing ring can prevent pressure from being extruded from the reverse side of the main sealing ring to cause abrasion and falling. Therefore,