The invention discloses an electrical-transmission slip ring and belongs to the field of diving signal transmission equipment. The electrical-transmission slip ring comprises a main shaft and a shell, wherein the outer side of the main shaft is sleeved with the shell; a plurality of transmission plates are axially arranged on the outer side wall of the main shaft at equal intervals, and a plurality of transmission rods making contact with the transmission plates are arranged on the inner side wall of the shell; a plurality of wire inlets connected with the transmission plates respectively are formed in one end of the main shaft, and a wire outlet connected with the transmission rods is formed in one end of the outer side of the shell; the end, provided with the wire inlets, of the main shaft is provided with a mounting and fixing plate, wherein the main shaft is sleeved with the mounting and fixing plate, and the mounting fixing plate is in bolted connection with the main shaft; the other end of the main shaft is provided with an end cover which is in bolted connection with the shell. According to the electrical-transmission slip ring, uninterrupted transmission of electric signals is achieved due to the fact that the transmission rods rotate around the transmission plates.