Pipeline transportation is one of the most important transportation methods used in the oil and gas industries. Therefore, pipeline safety monitoring is of great significance. In this paper, laser-ultrasonic visualization technology is used to detect internal defects in curved pipes. The experimental results show that the laser-ultrasonic visualization technology can intuitively detect internal defects in curved pipes through the dynamic propagation process of defect echoes. The defect location is analyzed according to the defect echo propagation rule, and the result shows that the maximum error of this method is 4%.