NOVELTY - The apparatus comprises a sealable reaction vessel (10) including an inlet through which an organic waste and a reactive additive are injected, an outlet (15) through which a treated substance is discharged as reactive gas, a unit to stir contents of the reaction vessel, a liquid fertilizer producer to condense the reactive gas discharged from the gas outlet with a cooling solution for producing a liquid fertilizer, while gradually increasing a concentration of fertilizer components of the cooling solution, an electric open/close valve, and a safety valve provided in the reaction vessel.    USE - The apparatus is useful for treating organic waste for preparing an organic combust and a liquid fertilizer.    ADVANTAGE - The apparatus ensures economical and rapid treatment of organic wastes without causing bad smell or waste water in an environmental friendly manner thus preparing the organic combust with high quality and the liquid fertilizer with high concentration.    DETAILED DESCRIPTION - The apparatus comprises a sealable reaction vessel (10) including an inlet through which an organic waste and a reactive additive are injected, an outlet (15) through which a treated substance is discharged as reactive gas, a unit to stir contents of the reaction vessel, a liquid fertilizer producer to condense the reactive gas discharged from the gas outlet with a cooling solution for producing a liquid fertilizer, while gradually increasing a concentration of fertilizer components of the cooling solution, an electric open/close valve, a safety valve provided in the reaction vessel, a unit to preheat the reaction vessel, a base frame to support the reaction vessel, a vessel frame mounted on the base frame to support the reaction vessel, and weight sensors mounted between the vessel frame and the base frame to sense the weight of the contents contained in the reaction vessel. The liquid fertilizer producer comprises: a cyclone condensation vessel to induce circling and ascending of the reactive gas; a liquid vessel that is configured to accept a liquid flowing downward from the condensation vessel and contains a cooling solution; and a cooling solution spray to elevate a cooling solution of the liquid vessel for spraying the cooling solution to an upper region inside the condensation vessel. The cyclone condensation vessel is provided at a lower side of the fertilizer producer with an inlet for the reactive gas and at an upper side of the fertilizer producer with an outlet for the remaining gas. The condensation vessel comprises partition boards to divide the condensation vessel into upper and lower parts for forming a curved passage, and carriers filled in an upper area of the partition boards to facilitate contact of the cooling solution sprayed from the top with the ascending reactive gas. The electric open/close valve is mounted in a pipe to connect the gas outlet to the condensation vessel, to open the gas outlet, when an inner pressure of the reaction vessel reaches a predetermined reaction pressure or higher and to close the gas outlet, when an inner pressure of the reaction vessel is less than the predetermined reaction pressure. The safety valve is configured to discharge the reactive gas to the outside, when the inner pressure of the reaction vessel is predetermined or higher. The stirrer comprises: a rotation axis (21) transversely passing through an inner center of the reaction vessel; a mixing blade mounted on the rotation axis; and a driving motor (24) mounted at an outer side of the reaction vessel to rotate the rotation axis. The mixing blade comprises: a first mixing blade, which spirally extends around the rotation axis such that the first mixing blade is close to an inner surface of the reaction vessel and is supported by support members that are radially extending from the rotation axis; and a second mixing blade extending from the rotation axis in a radial direction to a length shorter than a radius of the first mixing blade and having a torsion angle to stir contents, while transporting the contents in a direction opposite to the first mixing blade. The reaction vessel comprises: a cylindrical body; and a pair of caps connected to the ends of the body, where an outlet is provided under one cap to discharge waste treated in the reaction vessel by rotation of the first mixing blade. The pre-heating unit comprises: a water jacket mounted on the outer surface of the reaction vessel; and a warm water boiler to circulate warm water to the water jacket. The liquid fertilizer producer and the pre-heater are arranged under the base frame. An INDEPENDENT CLAIM is included for a method for treating organic waste.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of an apparatus for treating organic waste.    Reaction vessel (10)    Outlet (15)    Rotation axis (21)    Driving motor (24)    Belt. (26)