The laser ultrasonic visualization technology is used to study the reflection and transmission of pulsed laser excited surface waves on the defects with different depths. The visualized sound field of the surface wave at the defects is obtained experimentally. The research results show that as the defect depth increases, the reflection coefficient of surface wave first increases and then changes steadily, and however the transmission coefficient first decreases and then changes smoothly. These research results lay an experimental foundation for the quantitative detection of cracks by laser ultrasonic surface waves.