Exploring a rapid,reliable,and practical means to detect blockages and leakages in liquid pipelines and accurately locate their positions is of great importance in practical engineering applications.Here,we report a bubble motion-based triboelectric sensor(BM-TES)for detecting and locating the blockages and leaks inside a plastic tube.This simple-designed,environment-friendly,non-damaging sensor is composed of several ring-shaped Cu electrodes distributed on a polytetrafluoroethylene tube.The self-powered movement of the bubble under the action of buoyancy makes the inner wall of the tube change from the original solid-liquid phase to the gas-solid-liquid phase,which results in a short-term contact and separation between the liquid and the wall.Based on the fractional triboelectric effect of the liquid-solid contact,an obvious real-time stable voltage peak will be generated where the detection bubble passes.The obvious peaks of the open-circuit voltage with respect to time correspond with the electrode distribution.Then,the peaks can be utilized as a robust and sensitive indicator for detecting blockage and leakage,as the number of obvious peaks of the open-circuit voltage is directly related to the blockage and leakage location.The blockage and leakage in a fluid tube were successfully detected using the BM-TES with an accuracy of 10 cm.In addition,the BE-TES was able to detect the water flow velocity in the pipe.The experimental results showed that BM-TES can provide a new strategy and method for liquid tube monitoring and has great potential application value in related fields.