Provided are incombustible composition excellent in strength, water resistance and processability by using waste materials, and incombustible fire door and wall using the composition by hot pressing. The incombustible composition for fire door(wall) composition comprises the components of: 1-80wt.% of organic fiber such as crushed paper and wood, waste fiber or rice hull, or inorganic fiber such as glass wool or ceramic wool; 1-80wt.% of fly ash or bottom ash; 1-80wt.% of flame retardant such as CaCO3 or NaHCO3; 1-30wt.% of incombustible resin for hardening such as phenolic resin or polyester resin; 1-40wt.% of hollow sphere-type of filler such as perlite, fly ash or ceramics; and optionally 1-50wt.% of weight-lightening material such as perlite or vermiculite, and/or at least one additive selected from hardening promoter(MgO, gypsum plaster), surfactant and inorganic colorant. The incombustible fire door(wall) is manufactured by the following steps of: mixing fly or bottom ash, flame retardant, and resin; adding organic or inorganic fiber to mixtures and mixing, and adding hollow spheres by using air to prevent fibers from agglomerating; hot-pressing mixtures into a plate and/or square bar shape; forming a frame of fire door(wall) with plate and/or square bar, and filling the inside of the frame with fillers such as lightweight foam concrete, lightweight foam mineral board, rock wool, etc.
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