Computer room air conditioning system

An embodiment of the invention discloses a computer room air conditioning system. The computer room air conditioning system comprises a refrigeration part, a humidifier and a heat exchanger. The heat exchanger comprises a refrigerant input end, a refrigerant output end, a water input end and a water output end, the refrigerant input end is connected with a refrigerant output end of the refrigeration part, the refrigerant output end is connected with a refrigerant input end of the refrigeration part, the water input end is connected with a water source, and the water output end is connected with a humidification water input end of the humidifier. The heat exchanger is used for realizing heat exchange between a refrigerant transmitted by the refrigeration part and received humidification water, transmitting the cooled refrigerant to the refrigeration part and transmitting the heated humidification water to the humidifier. The computer room air conditioning system has the advantages that since the low-temperature humidification water is preheated by heat generated by the refrigerant transmitted by the refrigeration part, the temperature of the humidification water led into the humidifier rises, power consumption of the humidifier is reduced, and total energy consumption of the computer room air conditioning system is reduced correspondingly.