NOVELTY - Processing livestock urine, involves (a) using a tank, collecting urine from a livestock, preferably pig, adding the urine in first processing tank containing bacteria (effective microorganism), and storing the urine, (b) purifying the urine by adding floating sludge which is generated within the initial stage of purification, to a second processing tank, and (c) temporarily stopping ejector vacuum pump, and obtaining final-clarified urine.    USE - The method is useful for processing livestock, preferably pig urine (claimed).    ADVANTAGE - The method enables to process livestock urine simply and cost-effectively.    DETAILED DESCRIPTION - Method for processing livestock urine, involves (a) using a tank comprising first processing tank and second processing tank, where the construction ground of a tank is excavated to make a tank depressed ground, a banking portion is made at the edge of the tank depressed ground by setting excavated soil from the tank depressed ground as a banking, and to the inner side of the banking portion, the upper surface which gives a waterproof sheet place is opened from the tank depressed ground, collecting urine from a livestock, preferably pig, adding the urine in first processing tank containing bacteria (effective microorganism), and storing the urine, where the first processing tank comprises ejector vacuum pump in water, the ejector vacuum pump always stir the stored urine in the tank, the air bubbles are always dispersed in the stored urine, the proliferation activities of bacteria are promoted, urinary initial stage purification is advanced, and biochemical oxygen demand (BOD) in the urine is 300 mg/l, and nitrogen content in the urine is 700 mg/l, (b) purifying the urine by adding floating sludge which is generated within the initial stage of purification, to a second processing tank through a row arrangement conduit unit which carries out a flow from fist processing tank, where BOD of the urine is 46 mg/l or less, and nitrogen content in the urine is 100 mg/l or less, and (c) temporarily stopping the ejector vacuum pump, and obtaining final-clarified urine.