The invention belongs to the field of process industry production process monitoring, in particular to an interference alarm recognition method based on an alarm duration feature. The method comprisesthe following steps that: step S1, an acquired monitoring process signal is compared with an alarm threshold value thereof to generate an alarm signal; step S2, an alarm duration set is defined; stepS3, if C is not satisfied C > RC, there is no interference alarm, and an algorithm is ended; if C > RC, a sample probability distribution and an estimated geometric distribution of the alarm duration set are calculated; and step S4, degree of fitting R<2> between the sample probability distribution and the estimated geometric distribution is calculated; if the degree of fitting R<2> >= 0.95, alarms corresponding to elements in the alarm duration set are all interference alarms, and the entire algorithm is ended; if the degree of fitting R<2> < 0.95, a new alarm duration set is formed after a largest element in the alarm duration set is removed; and the method is skipped to step S3 to continue the calculation. The interference alarm recognition method based on the alarm duration feature provided by the invention provides an effective technical means for eliminating the interference alarm and realizing performance optimization of an alarm system.