The invention discloses a construction method of a permanent housing, which belongs to the field of constructions. The invention aims to build a firm and safe housing for people and adopts the following technical scheme: a building foundation and main body reinforced concrete are cast into a whole body by using a carefully special suit large formwork; a wall body is hollow and is divided into a main wall 4 and a leaf wall 5, or is divided into a main wall 4, a leaf wall 3 and a leaf wall 5; a hollow part can be filled with a heat preservation and insulation material or water; a roof is provided with a precast hollow component for heat preservation and insulation; the special suit large formwork can be designed into different forms, different sizes and different process modeling according to different regions, different cultures and different requirements so as to build housings with different types and different specifications for the people, and can be used repeatedly. The construction method realizes the mechanization of the whole construction process and does not use any building blocks and tiles, and the permanent housing is firm and safe, and realizes time saving, labor saving, high efficiency, energy saving and environmental protection.