Abstract: The novel PC composite box girder structure of long-span bridge made of corrugated steel web has been widely used at home and abroad, but the steel web weld seam detection is still not reliable nondestructive testing methods. Ultrasonic testing method of corrugated steel webs angle weld is proposed through experimental exploration, and first of all, ultrasonic testing program is analyzed according to the principle of ultrasonic propagation in the material; And then specimens with different defects are prepared according to the actual corrugated steel web plate; And finally experiment of ultrasonic testing is achieved, and the results were compared with experimental results of radiographic testing, and ultrasonic testing results and the ray detection results are in very good agreement, which can indicate that the ultrasonic testing method can achieve a better detection of this kind of structure.