In recent decades, in the high-end field of industrial equipment, there are many requirements such as revolution, rotation and other multivariate relative motion. That is, while the mechanical equipment rotates continuously at 360°, it also needs multiple motions on the rotating body. There is movement, it needs energy, such as electric energy, fluid pressure energy, etc. Sometimes, it is also necessary to control signal sources, such as optical fiber signals, high-frequency signals, etc. Any relatively continuous rotation of 360° between the electrical components need to transmit functional power, weak electric signal, optic signal, air pressure, water pressure, oil pressure and other different energy media, to ensure that the electrical equipment in the rotation movement can also move freely, must use the rotary connection device.