The utility model discloses a 10kV tension-rod lightning-protection insulator which comprises an insulator, and also comprises an arcing ring and a discharging ring. One end of the insulator is connected with the arcing ring, and the other end of the insulator is connected with the discharging ring. The insulator provided by the utility model is low in cost, convenient and flexible for construction and strong in mechanical performance, and has a function of lightning protection.