Building roof waterproof structure with waterproof layer convenient to replace

The invention relates to the technical field of building waterproofing, and provides a building roof waterproof structure with a waterproof layer convenient to replace, the building roof waterproof structure comprises a roof and a mounting frame fixed on the roof, and a heat insulation layer, a reinforcing layer and the waterproof layer are sequentially laid on the mounting frame from top to bottom; the heat insulation layer, the reinforcing layer and the waterproof layer are fixed through assembly parts to form a waterproof plate for protecting the roof, and the two ends of the waterproof plate are fixed to the mounting frame through mounting parts. The hole sealing piece, the threaded sleeve piece and the threaded inserting piece are designed to serve as a connecting structure, so that the heat insulation layer, the reinforcing layer and the waterproof layer can be fixed to form a waterproof plate overall structure of the roof, and in the fixing process, the lower wall of the first preformed hole of the rei