The invention relates to a sliding ring. The sliding ring comprises a transmission assembly, an installation assembly, a plurality of contact pieces and a plurality of fastening components, wherein the transmission assembly comprises a first rotation shaft and a second rotation shaft, the installation assembly comprises a first support rack and a second support rack, the first support rack is arranged corresponding to the first rotation shaft, the second support rack is arranged corresponding to the second rotation shaft, each contact piece is connected with the first rotation shaft and the second rotation shaft, and each fastening component is connected with each contact piece. In the sliding ring, the plurality of contact pieces are arranged and prop against the first rotation shaft andthe second rotation shaft so as to achieve electrical signal transferring; each contact piece is arranged on the installation assembly, so that the sliding ring is convenient to install and easy to process; the plurality of fastening components sleeve each contact piece, so that wear to the contact piece during the rotation process due to wear is effectively compensated, a connection relation between the contact piece and the transmission assembly is further ensured, and the electrical signal transferring is more reliable; and moreover, due to sleeving the fastening component, the capability of bearing vibration load by the sliding ring is improved.