Abstract: The ANSYS finite element analysis software was used to explore the relationship between the shape, width, depth, and detection speed of defects on the inner wall of steel pipelines and the dynamic eddy current field; Designed and built a rapid external detection testing device; Evaluated the characteristics of dynamic eddy current signals generated by different defect depths under high-speed detection conditions. The larger the aspect ratio of the defect itself, the stronger the magnetic induction intensity signal of the defect signal; As the detection speed increases, although the intensity of dynamic eddy current magnetic induction gradually decreases, the location and parameter information of defects can still be accurately detected; The experimental results and simulation results have the same trend of change. The experimental results show that the rapid external detection method for steel pipeline inner wall defects based on dynamic eddy current magnetic field can accurately locate and identify parameters of pipeline inner wall defects, providing theoretical reference and technical support for the rapid and accurate detection of pipelines.