NOVELTY - Device (100) comprises a livestock manure injecting unit (131), a pump for transferring livestock manure, a reaction unit maintained with high pressure of 1.1-100 atm, an ejector for supplying air to livestock manure, a pressure controlling unit for adjusting pressure of the reaction unit, a livestock manure discharging unit, a pressure gauge, a thermal insulation, a first storage tank (110) connected to the livestock manure injecting unit, a second storage tank (120) connected to the livestock manure discharging unit, connecting lines, and a scum discharging unit connected to a separator.    USE - The device is useful for fermenting livestock manure (claimed).    ADVANTAGE - The device reduces fermentation time of livestock manure, removes odor causing agents, and is environmentally friendly.    DETAILED DESCRIPTION - Device (100) comprises a livestock manure injecting unit (131) for injecting livestock manure (114) with predetermined viscosity, a pump for transferring livestock manure, connected to the livestock manure injecting unit, a reaction unit maintained with high pressure of 1.1-100 atm, connected to the pump, an ejector for supplying air to livestock manure, installed between the pump and the reaction unit, a pressure controlling unit for adjusting pressure of the reaction unit by controlling flow amount of livestock manure, connected to the reaction unit, a livestock manure discharging unit connected to the pressure controlling unit, a pressure gauge for measuring pressure of the reaction unit, a thermal insulation formed on external portion of the reaction unit, a first storage tank (110) connected to the livestock manure injecting unit for circulating livestock manure discharged from the livestock manure discharging unit into the livestock manure injecting unit, a second storage tank (120) connected to the livestock manure discharging unit, connecting lines for moving the livestock manure stored in the first storage tank and the second storage tank, and a scum discharging unit on top of the first storage tank or the second storage tank, connected to a separator for separating liquid and gas, where livestock manure fermentation in the reaction unit is promoted by amount of dissolved oxygen. The reaction unit increases amount of dissolved oxygen of air provided by the ejector in the livestock manure.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device is useful for fermenting livestock manure.    Device (100)    First storage tank (110)    Livestock manure (114)    Second storage tank (120)    Livestock manure injecting unit (131)