NOVELTY - The method comprises performing alkali hydrolysis of animal carcasses in a reaction chamber by adding water and reaction solution at predetermined concentration, sealing the chamber, increasing temperature of the chamber, pressurizing the chamber and then stirring, cooling the heated carcass by lowering the inside temperature, adding aerated carbon dioxide gas to lower the alkalinity inside the chamber and neutralizing the reaction solution in a primary neutralization process, adding a neutralization agent to a liquid storage tank to neutralize a drain in a secondary neutralization process.    USE - The method is useful for processing animal carcasses (claimed) for producing an organic liquid fertilizer.    ADVANTAGE - The method is capable of economically and quickly processing the animal carcass without any environmental pollutants such as greenhouse gas, fine dust and dioxin components and with reduced energy consumption.    DETAILED DESCRIPTION - The method comprises performing alkali hydrolysis of animal carcasses in a reaction chamber by adding water and reaction solution at predetermined concentration, sealing the reaction chamber, increasing temperature of the reaction chamber, pressurizing the chamber and stirring the animal carcass, cooling the heated animal carcass by lowering the inside temperature of the reaction solution, adding aerated carbon dioxide to lower the alkalinity inside the chamber and neutralizing the reaction solution in a primary neutralization process, adding a neutralization agent to a liquid storage tank to neutralize a drain in a secondary neutralization process. The alkali hydrolysis process is performed by stirring the reaction water in the reaction chamber, where the inner portion of the reaction chamber is washed during the hydrolysis process and the reaction solution is drained. The alkali hydrolysis is performed by adding alkali solution including 0.5-1.2 molar concentration of potassium hydroxide. The reaction chamber is heated at 80-200 degrees C at 20 atmospheric pressure. The reaction solution is stirred by a stirring unit, where a lower part of the reaction chamber includes an outlet for emitting air from an impeller. The first neutralization process is performed with an inner pressure of 1-2 atmospheric pressure. The aerated carbonic acid gas has pH of 9.5-10.5. An INDEPENDENT CLAIM is included for animal carcasses processing unit.