In recent years, China's economy has developed rapidly. With this, science and technology have also developed to a new stage, and the ultrasonic detection technology of pressure pipelines has developed. In addition, the aging problem of pipelines is becoming more and more serious. The integrity of oil and gas pipelines in operation and management process is greatly threatened. The more important one is the internal corrosion problem in pipelines. Therefore, accurate measurement of the inner wall information of the pipeline can contribute to the improvement of pipeline maintenance efficiency, and at the same time, can accurately predict the life of the pipeline. This paper will study the ultrasonic detection technology of pressure pipelines.