Roof flue structure

The utility model discloses a roof flue structure, and belongs to the technical field of building kitchen flue construction. The structure comprises a roof floor slab, a base and an air cap, a flue body is arranged at the bottom of the roof floor slab, the base is arranged on the roof floor slab and integrally cast with the roof floor slab, the air cap is connected with the top of the base through a brick masonry, and the brick masonry, the base and the roof floor slab are jointly provided with a channel communicated with the flue body; the outer surface of the base and the roof of the roof floor slab are jointly provided with a waterproof layer, and the outer surface of the brick masonry, the outer surface of the base and the waterproof layer are jointly provided with a plaster protection layer. The base and the roof floor slab are synchronously constructed and integrally poured and formed, so that the risk of cracks between the base and the roof floor slab is greatly reduced; meanwhile, the waterproof layer