Device for pyrolyzing and incinerating sludge by utilizing household garbage incineration flue gas

The utility model relates to a device for pyrolyzing and incinerating sludge by utilizing household garbage incineration flue gas, which comprises a household garbage incinerator, a waste heat boiler and a sludge receiving and conveying system, a sludge drying area, a pyrolysis gasification combustion area and a burnout area are sequentially arranged in the first flue of the waste heat boiler from top to bottom; and the sludge drying area is provided with a sludge atomizing and spraying device which is connected with the sludge receiving and conveying system and is used for spraying sludge from top to bottom. After being atomized, wet sludge is sprayed from the upper part of the first flue of the waste heat boiler, so that the atomized sludge is in contact with high-temperature flue gas, moisture is quickly evaporated, and drying is completed within an extremely short time. Equipment such as drying equipment and a dry powder sludge conveying and feeding device does not need to be independently arranged, so th