The utility model relates to an incinerator for processing nitrogen oxide exhaust gases, which can process the nitrogen dioxide exhaust gas. The utility model mainly comprises a furnace body, a main burner, an igniter, a primary air inlet and an auxiliary air inlet. The utility model is characterized in that the primary air inlet and an exhaust gas inlet are connected with each other and are installed on the main burner. The main burner is provided with a gas distribution plate. An air jacket is arranged out of the furnace body, and a three stage auxiliary air distributing hole is arranged on the furnace body. The utility model makes the burning sufficient. The auxiliary air is preheated by the air jacket and then enters a furnace hearth. On one hand, the utility model enables the unsafely burned fuel oil to burn sufficiently; on the other hand, the utility model can reduce the temperature of flue gas. The air jacket can also insulate the heat and can reduce the temperature of a furnace wall.