The invention discloses a DC power supply aging monitoring system. The DC power supply aging monitoring system comprises a monitoring device, a central processor and a terminal, wherein the monitoringdevice is connected with a data input module, the central processing unit is connected with the data input module, a GPS positioning module, an alarm module and a data transmission module, the data transmission module is in wireless connection with a monitoring management cloud platform, and the terminal is in wireless connection with the monitoring management cloud platform. The DC power supplyaging monitoring system monitors the aging degree of a DC power supply in real time through testing high-order ripples, voltage stabilization performance, internal resistance, voltage and AC components output by a switching power supply, improves the operation reliability of equipment, and avoids the potential safety hazards caused by aging of the DC power supply to operation of power secondary equipment.