The invention discloses a 1,200kV extra-high voltage suspension type composite rod insulator, which consists of two insulators, wherein the two insulators are connected in series through connecting fittings, and the highest voltage of each insulator is 1,200kV; each insulator comprises a mandrel, and a sheath and umbrella skirts which are arranged on the mandrel in a sleeving manner; voltage sharing rings are arranged at the two ends of the mandrels; a voltage sharing ring on the wire side is a double-layer voltage sharing ring. According to the 1,200kV extra-high voltage suspension type composite rod insulator, the double-layer voltage sharing ring is arranged on the wire side, and a special umbrella skirt design method is adopted, so that the 1,200kV extra-high voltage suspension type composite rod insulator has the advantages of light weight, strong strength, high hydrophobicity and hydrophobic mobility of a silicon rubber surface, high flashover voltage and the like, and the running requirements of an extra-high voltage power transmission line under extreme climate conditions of high humidity, high temperature and the like can be met.