For the issue of the industrial pipe wall lining the thickness of dynamic changes difficult to be measured, based on the principle of ultrasonic thickness measurement and ultrasonic propagation in solids and based on existing research and theory of ultrasonic, this topic has designed a ultrasonic technology solution for measuring the thickness of the pipe wall lining. This technology achieves online measurement and non-destructive thickness measurement. Through processing and analysis of the experimental results, it demonstrates the feasibility and reliability of the technology. This technology has great significance for improving the security and stability of the pipeline.