Aimed at the defects of traditional rotary joint such that working speed is low and working range is small, sealing device is easy to be corroded and has short service life at high pressure, the overall structure of the rotary joint was redesigned. The designed rotary joint adopted combined seal structure to ensure the rotary joint structure running smoothly at high pressure and high speed. The O-ring was designed in the most front of rotary joint to prevent corrosion caused by the medium in contact with the bearing parts. The combination structure of self-lubricating sliding bearings and plane rolling bearings was used to ensure the smooth running of sealing component at high speed. The sealing material of PTFE was used to extend the service life of rotary joints.