Building chimney bottom bearing foundation structure

The utility model provides a building chimney bottom bearing foundation structure which comprises a chimney body, a connecting plate is arranged at the bottom of the chimney body, a fixing device is arranged on the surface of the connecting plate, a connecting device is arranged at the top of the chimney body, and the fixing device comprises a rectangular plate. A rectangular rod and a connecting block are located on the same vertical plane, then the connecting block is slidably inserted into the bottom surface of a rectangular plate, then the rectangular rod is located on the surface of a round rod, and then the end, away from the round rod, of the rectangular rod slides to the surface of a supporting block; and then concrete is poured into the joint of the chimney main body and the connecting plate through the connecting rectangular hole, so that smoke dust is prevented from leaking from a gap between the connecting plate and the chimney main body, and the chimney main body can be conveniently fixed at the