Air steam gasification downdraft gasification combustion boiler with built-in catalyst

The invention particularly relates to an air-water vapor gasification downdraft gasification combustion boiler with a built-in catalyst, and belongs to the technical field of gasification furnaces, the air-water vapor gasification downdraft gasification combustion boiler comprises a gasification furnace body, a water vapor generation box and a mixing box body, a grate is fixedly mounted on the inner wall of the gasification furnace body, and the gasification furnace body is communicated with the mixing box body through a first transmission pipe; one end of the first transmission pipe is located above the grate, the mixing box body communicates with the water vapor generation box through a second transmission pipe, a gas inlet pipe is installed on the mixing box body, a heat conduction assembly is fixedly installed on the outer wall of the gasification furnace body, and one end of the heat conduction assembly wraps the first transmission pipe; according to the gasification furnace, a gasification agent obtaine