Abstract: The multiple impact equipment of short interval and multiple impact loading is the key equipment to verify the high impact resistance and initiation control strategy for multi-layer penetration fuze in laboratory, the motion law of the moving part under high impact has an important influence on the consistency of acceleration. In view of measurement problem of complex dynamic motion process under multiple high impact, a non-contact measurement method based on high-speed photography and image processing was presented, obtaining pixel coordinate of feature point of the moving part by background difference and feature point detection, combining with the sub-pixel algorithm, further improving the accuracy of measurement. The results of high-speed photography were verified by contrast experiment and dynamic simulation, proving that the method is reasonable and feasible for complex dynamic motion process measurement under high impact, providing support for optimal design of the multiple impact equipment, also enriching the existing methods of complex dynamic motion measurement.