NOVELTY - A purification system for livestock wastewater which settles unbalance of nutrient elements of microorganisms by partially oxidizing recalcitrant pollutants, partially oxidizes and therefore removes toxicity of agricultural chemicals, disinfectant and antibiotic, and discharges only wastewater purified through an effluent tank, is new.    DETAILED DESCRIPTION - The purification system for livestock wastewater comprises:    (a) a catchment tank in which collected wastewater is stored;    (b) a facultative anaerobic tank for sending wastewater to a pumping tank after passing the wastewater flown in through a drum screen so that the wastewater is digested in the drum screen for a certain period of time when wastewater is flown into the catchment tank;    (c) a neutralization tank into which the wastewater passing the pumping tank is flown so that the flocculation of wastewater is conducted by adding chemicals;    (d) a flotation tank for separating sludge contained in the wastewater when the flocculated wastewater is flown into the flotation tank;    (e) a first ozone oxidation tank for settling unbalance of nutrient elements of microorganisms by partially oxidizing recalcitrant pollutants, removing toxicity by partially oxidizing agricultural chemicals, disinfectant and antibiotic used and removing factors deteriorating growth of microorganisms when the sludge removed wastewater is flown into the first ozone oxidation tank through the flotation tank;    (f) an oxidation tank which aerates the wastewater for a long period of time when wastewater is flown into the oxidation tank in the state that residual ozone which is not removed in the first ozone oxidation tank is removed in the stabilization tank, and which sends the aerated wastewater to a flow equalization tank through a first precipitation tank;    (g) a flocculation tank for flocculating the wastewater depending on variation of the load amount when load amount of pollutants are high in the wastewater even though the wastewater is aerated in the oxidation tank for a long time;    (h) a second precipitation tank to which the effluent from the flocculation tank is transferred; and    (i) a second ozone oxidation tank for treating the wastewater passing a pumping tank, activated carbon filtering the advance treated wastewater through an activated carbon filter, and discharging the purified wastewater only to the outside through a discharge tank.