The invention provides a foamed aluminum building non-dismantling formwork. The formwork comprises a building formwork body, wherein the building formwork body is of a plate-shaped structure or a columnar structure, the columnar structure is internally provided with a hollow cavity capable of allowing reinforced concrete to be poured, and a main body of the building formwork body is made of foamedaluminum. The inner side, making contact with concrete, of the building formwork body is a formwork composite face, the outer side, not making contact with the concrete, of the building formwork bodyis a formwork decorative face, and the formwork composite face is provided with a rough surface for increasing the binding force with the concrete. The foamed aluminum building non-dismantling formwork has the characteristics that foamed aluminum is ingeniously applied to a building front-end process in advance, the advantages are made best use of and the disadvantages are bypassed, the foamed aluminum building non-dismantling formwork is directly compounded on the surface of a building and integrally compounded with reinforced concrete of columns, beams and walls, the foamed aluminum building non-dismantling formwork has the characteristics of being small in density, high in impact absorption capacity, resistant to high temperature, good in heat preservation performance and the like, onone hand, the performance of the columns, beams and walls of the building is improved, and on the other hand, building processes are reduced.