The invention relates to a on-line-monitoring yellow wine storage system and method. The system comprises a micro-oxygenation aeration head, a pH probe, a pressure sensor, a metal temperature sensor, a dissolved oxygen electrode and a mass flowmeter which are installed on a wine storage tank and respectively connected with a computer, wherein an A/D (analog-to-digital) converter is connected between the mass flowmeter and the computer; and a D/A (digital-to-analog) converter is connected between the computer and the pressure sensor. When the pottery jar wine storage is changed into large tank wine storage, the large tank wine storage is monitored in real time, thereby preventing the yellow wine from deterioration and causing great loss for the enterprise.