The invention relates to a flexible pipeline of an electric propulsion system thrust vector adjustment mechanism. According to the flexible pipeline, a flow passage is composed of capillary pipes. The flexible pipe comprises two straight sections, two small-diameter transition spiral sections, one large-diameter spiral section, a spherical head and an outer sleeve nut. The large-diameter spiral section can achieve large-angle flexible deformation with small additional moment, the small-diameter transition spiral sections have a transition function, enable the straight sections to be led out along the central axis of the large-diameter spiral section and can reduce transverse displacement in the process of flexible deformation. Each set of pipelines comprise three independent capillary pipes which are arranged in the shape of a Chinese character 'pin' and are compressed through a heat-shrinkable T bush, structural stability is guaranteed, and the capillary pipes are prevented from being damaged. The spherical head is connected with the capillary pipes in a fuse welding mode, so that connecting strength is improved. The flexible pipeline of the electric propulsion system thrust vector adjustment mechanism achieves flexibility of a satellite propulsion system pipeline, obviously reduces the deformation additional moment of the pipeline and well meets the requirement for satellite electric propulsion system thrust vector adjustment.