The invention discloses an alarm management method of a subway monitoring system. The scheme is characterized in that, a life period for an alarm is defined, and the alarms are managed in a complete process of alarm generation, alarm disappearance, and alarm confirmation. In addition, the alarms are divided into real-time alarms and historical alarms, wherein the real-time alarms show an alarm state of a current device, and the historical alarms show that alarms which end the alarm life periods are under normalized management, and alarm generation time, alarm disappearance time, and alarm confirmation time are recorded in detail in the same alarm record. In the way, when looking for an alarm of a device, a complex mode that respective query of an alarm generation record, an alarm disappearance record, and an alarm confirmation record, and summarizing and analyzing are needed is prevented, and instead, a simple and direct way is provided for an operator to perform alarm query, and therefore management efficiency and correctness of accident analysis are improved. The scheme is suitable for all subway monitoring systems.