An air compression system, comprising: an air compression device, comprising a compressor and a liquid-cooled motor for driving the compressor; and a cooling structure, comprising: a radiator, interconnecting the compressor, for cooling a lubricating liquid filling the compressor; a cooler; characterized by comprising: a first liquid conveying tube, bridging and interconnecting the radiator and the cooler; a second liquid conveying tube, bridging and interconnecting the radiator and the cooler; a third liquid conveying tube, bridging and interconnecting the liquid-cooled motor and the cooler; a fourth liquid conveying tube, bridging and interconnecting the liquid-cooled motor and the cooler; and a cooling liquid, the air compressor system being configured so that a portion of the cooling liquid fills the cooler, and a portion of the cooling liquid is inputted into the radiator through the first liquid conveying tube and flows back to the cooler through the second liquid conveying tube, and another portion of the cooling liquid is inputted into the liquid-cooled motor through the third liquid conveying tube and flows back to the cooler through the fourth liquid conveying tube. an air compression device, comprising a compressor and a liquid-cooled motor for driving the compressor; and a cooling structure, comprising: a radiator, interconnecting the compressor, for cooling a lubricating liquid filling the compressor; a cooler; characterized by comprising: a first liquid conveying tube, bridging and interconnecting the radiator and the cooler; a second liquid conveying tube, bridging and interconnecting the radiator and the cooler; a third liquid conveying tube, bridging and interconnecting the liquid-cooled motor and the cooler; a fourth liquid conveying tube, bridging and interconnecting the liquid-cooled motor and the cooler; and a cooling liquid, the air compressor system being configured so that a portion of the cooling liquid fills the cooler, and a portion of the cooling liquid is inputted into the radiator through the first liquid conveying tube and flows back to the cooler through the second liquid conveying tube, and another portion of the cooling liquid is inputted into the liquid-cooled motor through the third liquid conveying tube and flows back to the cooler through the fourth liquid conveying tube. a radiator, interconnecting the compressor, for cooling a lubricating liquid filling the compressor; a cooler; characterized by comprising: a first liquid conveying tube, bridging and interconnecting the radiator and the cooler; a second liquid conveying tube, bridging and interconnecting the radiator and the cooler; a third liquid conveying tube, bridging and interconnecting the liquid-cooled motor and the cooler; a fourth liquid conveying tube, bridging and interconnecting the liquid-cooled motor and the cooler; and a cooling liquid, the air compressor system being configured so that a portion of the cooling liquid fills the cooler, and a portion of the cooling liquid is inputted into the radiator through the first liquid conveying tube and flows back to the cooler through the second liquid conveying tube, and another portion of the cooling liquid is inputted into the liquid-cooled motor through the third liquid conveying tube and flows back to the cooler through the fourth liquid conveying tube. a first liquid conveying tube, bridging and interconnecting the radiator and the cooler; a second liquid conveying tube, bridging and interconnecting the radiator and the cooler; a third liquid conveying tube, bridging and interconnecting the liquid-cooled motor and the cooler; a fourth liquid conveying tube, bridging and interconnecting the liquid-cooled motor and the cooler; and a cooling liquid, the air compressor system being configured so that a portion of the cooling liquid fills the cooler, and a portion of the cooling liquid is inputted into the radiator through the first liquid conveying tube and flows back to the cooler through the second liquid conveying tube, and another portion of the cooling liquid is inputted into the liquid-cooled motor through the third liquid conveying tube and flows back to the cooler through the fourth liquid conveying tube.