NOVELTY - The method comprises: recycling an organic waste using a fermenter, a dryer and a carbonizing machine, where the dryer is kiln drier or paddle dryer; guiding an exhaust gas emitted from the kiln dryer to a heat exchanger; selectively or simultaneously guiding the exhaust gas through the kiln dryer, the paddle dryer to prepare the fuel and a fertilizer. The carbonizing machine dries the exhaust gas at a high temperature. The cocopeat, the rice hulls and the coconut meal are mixed with the organic waste in the fermenter. The organic waste is carbonized to prepare the fuel.    USE - The method is useful for treating organic waste to recover waste heat and to prepare carbonized fuel or fertilizer (claimed), where the organic waste is wastewater sludge or livestock excretions.    ADVANTAGE - The method is capable of efficiently recycling the organic waste of the solid livestock excretions and fluid livestock wastewater, and preparing fuel or fertilizer, thus preventing environmental contamination e.g. soil pollution and ground water pollution.    DETAILED DESCRIPTION - The method comprises: recycling an organic waste using a fermenter, a dryer and a carbonizing machine, where the dryer is kiln drier or paddle dryer; guiding an exhaust gas emitted from the kiln dryer to a heat exchanger; selectively or simultaneously guiding the exhaust gas through the kiln dryer, the paddle dryer to prepare the fuel and a fertilizer. The carbonizing machine dries the exhaust gas at a high temperature. The cocopeat, the rice hulls and the coconut meal are mixed with the organic waste in the fermenter. The organic waste passing through the kiln drier is carbonized using the carbonizing machine to prepare the fuel. The carbonized fuel prepared through the carbonizing machine is passed through the kiln drier and paddle dryer. The exhaust gas passed through the paddle dryer to prepare the fertilizer, where the fuel has a water content of 0.01-5%, and the fertilizer has the water content of 10-40%.