Method of natron delignification of paulownia is carried out by loading chips of annual paulownia wood into a cooking apparatus, after which they are poured with a solution of sodium hydroxide for cooking at a hydraulic module of 5:1 and impregnated with this solution. The chips are then cooked to produce semi-finished products, which are ground and samples are made. For cooking, a sodium hydroxide solution is used with an active alkali consumption of 20% by weight. Na2O by weight of absolutely dry wood, the wood chips are impregnated during the temperature rise from 110 to 170°C for 120 minutes, and the chips are directly cooked at a final temperature of 170°C for 120 minutes. The sodium hydroxide solution for cooking can be supplemented with substances to enhance delignification, namely anthraquinone solution in the amount of 0.1% by weight of absolutely dry wood or ethyl alcohol in the amount of 20% by volume.