Abstract: Using digital radiography inspection technology to conduct regular corrosion inspection and corrosion depth measurement on pressure pipelines. Different process parameters are used in the process of the inspection test. Taking into account that the relationship between the gray value of the collected image and the thickness of the transillumination is similar to an exponential curve, digital radiography is used to detect the gray level of the point of the known thickness near the corrosion position of the measurement pipeline. Through two-point fitting exponential curve, after substituting the gray value of the corrosion position into the exponential function, the corrosion depth is calculated, and the test is verified. The result shows that the error between the calculated value and the measured value is very small, and the result provides reference for research and engineering applications.