The invention provides a flexible probe ring for a pipeline guided wave detection system. A plurality of probe module seats (7) and probe module press sheets (8) are installed on the inner side of a steel ring (9) with a circular opening along the axial direction, a probe module interface (6) is arranged at one end of the side of each probe module seat (7), and an air wrapping belt (11) with a circular opening is wrapped outside the steel ring (9), an air bag (12) is arranged in the air bag wrapping belt (11), and an outer cover layer (10) with a circular opening is further wrapped outside the air bag wrapping belt (11). The outside of the outer cover layer (10) is fixedly connected with a lemoTM interface seat (2) and an inflation opening (4). Each ends of the openings of the steel ring (9), the air bag wrapping belt (11) and the outer cover layer (10) are connected with one end of a butt joint clamp (5). A probe module (1) is connected with the lemoTM interface seat (2) on a probe ring (1) through a cable and then is connected with a system host. The flexible probe ring for the pipeline guided wave detection system is good in mechanical coupling effect, light and convenient to transport, not easy toe abrade and damage.