System and method for accurately positioning defects in pipeline

The invention relates to a system and method for accurately positioning defects in a pipeline. The system comprises an in-pipeline detector (1), marking boxes (3), a time service device and a processor; the in-pipeline detector (1)is disposed in the pipeline (2) and is used for detecting the defects (5) in the pipeline (2) and recording the defect detection time; the marking boxes (3) are arranged on the ground (4) and located over the pipeline (2), and the multiple marking boxes (3) are arranged in the direction of the pipeline (2) and used for recording the time when the in-pipeline detector (1) sequentially passes through the positions of the marking boxes (3); the time service device is used for carrying out synchronous time service on the in-pipeline detector (1) and the marking boxes; and the processor is used for receiving the defect detection time of the in-pipeline detector (1), the time when the in-pipeline detector (1) sequentially passes through the positions of the marking boxes (3) and the posit