The invention discloses a mountain area pipeline strain on-line monitoring system and method. The safety system comprises a strain gauge, a strain collector, a signal controller, a network camera, a wind-solar complementary power supply and on-line monitoring software. The whole system comprises four pairs of strain gauges, each pair of strain gauges is divided into an axial strain gauge and an annular strain gauge, the strain gauges are installed at two positions on the pipeline, the distance between the two positions is 1km, the system adopts a solar panel and a wind driven generator to generate power, the strain collector and the online monitoring software collect and process data once every 20s, the online monitoring software dynamically displays and analyzes the strain of the pipeline, and meanwhile, a network camera is carried, and external environment factors causing strain mutation are analyzed. According to the invention, real-time dynamic monitoring and analysis of the safety state of the pipeline in the mountainous area can be realized.