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This disclosure relates to the technical field of gas pipeline condition monitoring devices. It provides a collision alarm device for overhead natural gas pipelines, used to monitor the columns supporting overhead natural gas pipeline sections. The device includes a swing arm, a sliding member, a pressure sensor, and an elastic member. The swing arm is oscillatingly mounted on the column. The sliding member is slidably mounted on the column and contacts the swing arm, configured such that after the swing arm oscillates, the swing arm pushes the sliding member to slide. The pressure sensor is mounted on the column and is used to transmit data to an external controller. The two ends of the elastic member act on the sliding member and the pressure sensor, respectively, to absorb the force between the swing arm and the sliding member and transmit the force to the pressure sensor. This technical solution solves the problem in related technologies where collisions or scrapes between external objects cause pipeline leaks in overhead sections of natural gas pipelines or columns, leading to untimely detection, natural gas loss, and increased on-site safety hazards.