The embodiment of the invention discloses a method and a device for processing alarm information. The method comprises the following steps of: determining an upper edge and a lower edge of a first time window; counting the total fault duration in the first time window; and selecting a time to report the fault-generating alarm if the total fault duration reaches a first threshold value. The devicecomprises a first time window module, a first counting module and a first alarming module, wherein the first time window module is used for determining the upper edge and the lower edge of the first time window; the first counting module is used for counting the total fault duration in the first time window; the first alarming module is used for selecting the time to report the fault-generating alarm if the total fault duration reaches the first threshold value. Because the ratio of the total fault duration accounting for the time window is used for judging whether to generate the alarm or not, the faults and the quality of the service are combined with each other more tightly so as to process the alarm information better according to the generating times and the duration of the faults.