Expressway abnormal event detection method and system

The invention discloses an expressway abnormal event detection method and system, and the method comprises the steps: collecting parallel multi-path optical fiber signals on an expressway through a distributed optical fiber sensing system disposed in an expressway guardrail, and enabling the distributed optical fiber sensing system in the expressway guardrail to be provided with optical fibers in the direction of the expressway, signals of a plurality of detection points are obtained in space, and each optical fiber signal comes from one detection point; performing energy monitoring on each detection point along the highway, regarding the current detection point as a to-be-analyzed detection point when signal output energy is greater than a set threshold value, collecting optical fiber signals of one or more detection points adjacent to the to-be-analyzed detection point, and performing feature extraction on the optical fiber signals of each detection point; performing feature fusion on the features of each t