Abstract: In recent years, the construction of road and bridge engineering in China has attracted more attention from all walks of life. As one of the key means of engineering quality control, whether the test and detection work can be carried out effectively directly affects the rationality of road and bridge engineering construction and maintenance. Nondestructive testing technology integrates the knowledge of mechanical engineering, material engineering, computer science and other fields, and applies it to road and bridge engineering. On the premise that road and bridge engineering is not damaged and affected, more accurate and comprehensive quality testing is carried out. Therefore, how to apply NDT technology reasonably in road and bridge construction has become the focus of construction enterprises. This paper starts with the analysis of the application significance of NDT, and on the basis of this, expounds the concrete application of NDT in road and bridge.