The invention relates to nitrogen-generating compositions for saturation fire-extinguishing and to methods for producing same. The composition comprises: 25.0-45.0% by mass of a heavy metal oxide, 12.0-18.0% by mass of a combustion modifier in the form of aluminium oxide modified with cobalt (II) nitrate (Co(NO3)2), with accelerating additives of nickel oxide and copper oxide, with an alkali metal azide making up the remainder to 100% and 0.07-2.0% by mass of a carboxylic acid ester as moistener (residue after drying) above 100%. The composition is produced by mixing aluminium oxide with cobalt nitrate and with the moistener, allowing the mixture to stand and dry out so as to produce a first mixture, separately mixing the first mixture with the heavy metal oxide and the moistener until a second mixture is produced, separately preparing a mixture of alkali metal azide powder with the moistener until a third mixture is produced and then mixing the second mixture and the third mixture simultaneously with copper oxide and nickel oxide, drying out the produced mass and forming granules.