The invention discloses a gas discharge tube which comprises an insulation shell and two conductive electrodes, wherein the insulation shell and the two conductive electrodes form a closed space; and the projecting ends of the two conductive electrodes of the gas discharge tube are arranged in a staggered mode. The projecting ends of the two conductive electrodes of the gas discharge tube are arranged in a staggered mode, thereby increasing the discharge emission surface area of the gas discharge tube and providing a larger closed inflation space; the projecting ends of the conductive electrodes can provide point discharge and perform a triggering function, and the triggering mode is more flexible; and the closed space formed by the conductive electrodes and the insulation shell contains hydrogen and/or inert gas, thereby lowering the pulse shock voltage on the premise of increasing the through flow of the gas discharge tube and ensuring the small size of the product.