To address the challenge of balancing a large field of view and high-resolution flow field measurement in 3D scaled model tests of landslide-generated impulse waves, we developed a PIV analysis system for large-scale landslide-generated impulse waves based on a multi-lens array camera. This system integrates four key technologies: wide-angle distortion correction, irregular image corner point mapping, rapid image fusion and stitching, and PIV analysis for large-scale landslide-generated impulse wave flow fields. It enables observation and PIV analysis of the movement process of landslide-generated impulse waves in 3D scaled model tests. Taking the large-scale 3D physical model test of Wangjiashan landslide-generated impulse waves as an example, PIV analysis of the landslide-generated impulse wave flow field was conducted. The results verify the accuracy and feasibility of the PIV analysis system for large-scale landslide-generated impulse waves, providing a reference for further research on the movement process of landslide-generated impulse waves in 3D scaled model tests.