Air pressure nitrogen making machine system

The utility model discloses an air pressure nitrogen making machine system which comprises a first nitrogen making unit and a second nitrogen making unit, and buffer tanks of the first nitrogen making unit and the second nitrogen making unit convey bottom accumulated liquid to a water collecting tank through liquid discharging pipes. According to the device, liquid in the buffer tank is discharged into the water collection tank along the liquid discharge pipe to be stored, and is conveyed to a water treatment system through a water discharge pump to be recycled, so that water resources are greatly saved, and the device is environment-friendly and energy-saving. The heating assembly is used for heating the water collecting tank and the liquid discharging pipe through heat dissipation airflow of the air compressor, the phenomenon that liquid in the liquid discharging pipe and the water collecting tank is frozen in winter is avoided, and the stability of liquid discharging in the water collecting tank is guarant