NOVELTY - Device comprises e.g. a solid-liquid separating unit for separating solid and liquid from livestock manure, a cylindrical sterilizing pipe for accommodating solid-liquid separated livestock manure, a heater installed on a heating zone for sterilizing and arranged within sterilizing pipe, a sterilizing unit equipped with a cooler having a cooling zone for cooling livestock manure, a cylindrical fermentation pipe for accommodating livestock manure cooled and sterilized from sterilizing unit, and a conveying screw installed on sterilizing pipe and fermentation pipe for conveying livestock manure.    USE - The device is useful for composting livestock manure (claimed).    ADVANTAGE - The device improves thermal efficiency, shortens process time, removes large amount of foam generated during solid-liquid separation of livestock manure, controls water content of solid-liquid separated livestock manure sludge, continuously performs high-temperature sterilization and cooling, and minimizes decrease in sterilizing and cooling efficiency.    DETAILED DESCRIPTION - Device comprises a solid-liquid separating unit (110) for separating solid and liquid from livestock manure, a cylindrical sterilizing pipe (131) for accommodating solid-liquid separated livestock manure in the form of sludge, a heater installed on a heating zone for sterilizing and arranged within the sterilizing pipe, a sterilizing unit (130) equipped with a cooler having a cooling zone for cooling the livestock manure and placed at the rear end of the heating zone, a cylindrical fermentation pipe (151) for accommodating and supplying livestock manure cooled and sterilized from the sterilizing unit, a conveying screw installed on the sterilizing pipe and the fermentation pipe for conveying the livestock manure, an oxygen supplying unit installed at a predetermined interval on the outer peripheral surface of the fermentation pipe for supplying oxygen, at least one fermenting unit (150) provided with a microorganism injecting unit for injecting microorganism and installed at one side of the fermentation pipe, a cylindrical mature pipe for accommodating and supplying livestock manure fermented from the fermenting unit, a maturing unit having a cooling machine for cooling the fermented livestock manure, and a deodorizing unit for discharging ad purifying gas and installed on the sterilizing pipe, fermentation pipe or the maturing unit. The sterilizing pipe is provided with a first pipe having an inlet port, a second pipe having an outlet port, and a heat insulating unit for blocking heat conduction and arranged between the first pipe and the second pipe. The heating zone and the cooling zone are arranged on the first pipe and the second pipe. An INDEPENDENT CLAIM is also included for composting livestock manure, comprising (a) providing livestock manure in the form of sludge having moisture content of 20-40% by separating solid and liquid using the solid-liquid separating unit, (b) supplying the solid-liquid separated livestock manure sludge into the sterilizing pipe, sterilizing by heating at 100-150 degrees C by the heater, cooling the sterilized livestock manure at 50-70 degrees C using the cooler, and conveyance the livestock manure by the conveying screw which is installed on the sterilizing pipe, and (c) supplying the sterilized and cooled livestock manure into the fermentation pipe containing microorganism and oxygen, and fermenting at 40-60 degrees C for 2-4 days using fermentation heat without additional heat supply.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device (Drawing includes non-English language text).    Solid-liquid separating unit (110)    Sterilizing unit (130)    Sterilizing pipe (131)    Fermenting unit (150)    Fermentation pipe (151)