The invention provides an alarm monitoring method and a system. The method comprises steps that step S1, a power plant system is divided into multiple partitions and sub partitions according to power plant system functions; an alarm monitoring interface (100) is set, and the alarm monitoring interface (100) is fixedly provided with alarm monitoring sub interfaces corresponding to the partitions and the sub partitions; step S2, alarm of the partitions and the sub partitions is monitored; according to alarm states and priority of the partitions or the sub partitions, an alarm signal according to the partitions or the sub partitions is outputted; step S3, in the corresponding alarm monitoring sub interfaces, an indication signal corresponding to the alarm signal is displayed; in the step S3, the indication signal is a signal displayed by the corresponding alarm monitoring sub interface with corresponding flicker frequency and color difference according to the alarm state and priority of each partition or the sub partition. The method is advantaged in that the method is visual and practical, and the alarm monitoring effect is good.