Five-layer structure plane construction method: first, the whole steel bar binding and formwork support are completed, and the whole large area is covered with plastic cloth for protection after acceptance, and the whole area is watered once the temperature rises and becomes stable. The space above the four-storey structure plane is provided with closed heating to ensure the even temperature of the five-storey structure plane. The other construction methods are the same as the construction method of the post-pouring belt.