The slip ring as a whole depends on the elastic lap principle, the rolling lap principle, or the sealing principle, as well as the ingenious movement structure and sealing structure design, precise parts production and coordination, reasonable selection of materials, etc., to form a stable and reliable rotating connected system. As long as the slip ring is attached to the equipment of infinite rotation, it can provide power energy to the rotating body, so that the rotating body can also carry out other movements or detect the working conditions under the state of rotation while moving in infinite rotation.