Ammonia gas burner and ammonia gas burning system

The invention relates to an ammonia gas burner and an ammonia gas burning system.The ammonia gas burner comprises a boiler, a shell and an ejector, the shell is arranged outside the boiler, an ammonia gas connector, an air inlet connector, a smoke connector and a discharging port are formed in the shell, a reaction cavity is formed in the shell, and the ejector is arranged in the reaction cavity. The flue gas connector and the discharging port are both communicated with a hearth of the boiler, the ejector is arranged in the reaction cavity and provided with an inlet end, an outlet end and a suction end, the ammonia gas connector is communicated with the inlet end, the suction end is communicated with the flue gas connector, and the outlet end is communicated with the outlet end. And the outlet end and the air inlet interface are communicated with the discharge hole through the reaction cavity. According to the ammonia gas burner, ammonia gas and air can be preheated, the reaction rate can be increased, and th