Ammonia spraying device applied to low-temperature incineration denitration of garbage

The utility model relates to the technical field of environmental protection, in particular to an ammonia spraying device applied to low-temperature incineration denitration of garbage, which comprises a connecting pipe and a plurality of mixed ammonia spraying heads, one end of the connecting pipe extends into a flue to be connected with the mixed ammonia spraying heads, and the other end of the connecting pipe extends out of the flue to be connected with ammonia production equipment. The mixing ammonia spraying head sequentially comprises a mixing pipe and a communicating part from top to bottom, the communicating part comprises a flue gas chamber and an ammonia gas chamber, the flue gas chamber and the ammonia gas chamber are mutually independent and do not communicate with each other, the upper end of the flue gas chamber is connected with the mixing pipe, the lower end of the flue gas chamber is provided with a through opening, and flue gas in a flue can enter the mixing pipe of the mixing ammonia sprayi