The invention belongs to the field of power distribution and power utilization, and particularly relates to a gas discharging lamp and a trigger thereof. According to the gas discharging lamp provided by the embodiment of the invention and the trigger with an overheating protection function of the gas discharging lamp, a thermistor device is additionally arranged on the basis of an existing trigger, so that the overheating protection function can be increased in a trigger circuit of the gas discharging lamp. If an overheating phenomenon occurs in a use process of the gas discharging lamp, a power supply can be automatically switched off and the trigger stops working, so that the product and the personal safety of a user are protected. The trigger with the overheating protection function is simple and reliable in design, is low in cost and can work stably, and can meet the HID (high intensity discharge) triggering requirements of various gas discharging lamps.