The rotary joint for a vacuum device is an execution part for conveying a fluid medium on a vacuum rotary device. For example, hot water is used as a heating medium of a vacuum chamber to circulate and is used to control the temperature of vacuum operation. Traditional rotary joints generally need to fix the outer ring and rely on the rotation of the inner ring to realize the mechanical function. Since the vacuum rotary equipment needs to extract vacuum, the inner ring of the rotary joint is fixed and the outer ring is rotated. There is currently no rotary joint designed by Zhuanmen for vacuum installations.