Pre-ionization trigger rod and gas switch employing same

The invention relates to a pre-ionization trigger rod and a gas switch employing the same. A pre-ionization trigger needle and a high-voltage isolation resistor are integrally designed and are directly matched with a trigger electrode to achieve the purposes of trigger simplification and compact structure. The structure of the pre-ionization trigger rod comprises a ceramic insulation tube, a trigger needle, a high-voltage resistor and a metal sleeve ring, wherein the trigger needle comprises a front-end electrode, an intermediate needle rod and a rear-end needle tip, the intermediate needle rod of the trigger needle is inserted into a ceramic insulation tube, one end of the ceramic insulation tube is exposed out of the rear-end needle tip, the other end of the ceramic insulation tube is embedded into the front-end electrode of the trigger needle, the metal sleeve ring sleeves the outer surface of the ceramic insulation tube, the high-voltage resistor is further arranged on the outer surface of the ceramic ins