Abstract: An air conditioning system of data center using heat pipe includes a cooling room that allows air within the data center to be drawn in by a first fan and circulated and fed back to the data center; a heat radiation room located separately from the cooling room; a heat pipe installed such that evaporator and condenser are located in the cooling room and heat radiation room, respectively; a sprayer installed in the heat radiation room and provided with a plurality of spray nozzles for spraying cooling fluid to the condenser; a cooling unit installed in the cooling room and cooling the air that passed the evaporator through heat exchange; dry bulb temperature measurement unit and wet bulb temperature measurement unit; and a control unit that receives the detection signal from the dry and wet bulb temperature measurement units and controls the sprayer and the cooling unit.