NOVELTY - The screw stirrer comprises multiple screw mixers (20), a first transfer frame (11), and a second transfer frame (12). The screw stirrer is side by side arranged in a diagonal direction with a tangent line, where the diagonal direction is a center of a biaxial transferring direction of the first and second transfer frames. The multiple screw mixers are installed in a top of the first transfer frame transferred to the former/after at an upper part of a reaction bath. The multiple screw mixers stir the organic compound contained in an anaerobic or aerobic reactor.    USE - The screw stirrer is useful for composting aerobic/anaerobic organic compound.    ADVANTAGE - The screw stirrer exhibits improved stirring efficiency.    DETAILED DESCRIPTION - The screw stirrer comprises multiple screw mixers (20), a first transfer frame (11), and a second transfer frame (12). The screw stirrer is side by side arranged in a diagonal direction with a tangent line, where the diagonal direction is a center of a biaxial transferring direction of the first and second transfer frames. The multiple screw mixers are installed in a top of the first transfer frame transferred to the former/after at an upper part of a reaction bath. The multiple screw mixers stir the organic compound contained in an anaerobic or aerobic reactor. A gap is present in inverse proportion between screw mixers after the former/and left/right interval. Each screw mixer is hinged in the second transfer frame so that the adjusting angle is possible. One of the screw mixers have a longitudinal axis with long length compared with other screw mixer. Other screw mixer is installed to upwardly slope at a constant angle, and has the same length. A load (124) of a hydraulic cylinder (123) is bonded to each screw mixer. Each screw mixer has an exhaust tube in which the tube is connected to a slurry tank for storing the organic compound at a top of a rotary shaft. The organic compound is guided to an inside axial direction of the rotary shaft in an outer periphery of the rotary shaft. Multiple discharge holes are connected to the exhaust tube to eject the organic compound guided through the exhaust tube to the width direction of the rotary shaft.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic perspective view of a screw stirrer.    First transfer frame (11)    Second transfer frame (12)    Screw mixer (20)    Bracket (121)    Hydraulic cylinder (123)    Load. (124)