In this paper, the whole cavitation collapse process was divided into cavitation moving phase and cavitation collapse shock phase based on the physical phenomenon of cavitation collapse process, potential flow method and Nonlinear Doubly Asymptotic Approximation(NDAA) were respectively used to calculate the two stages to make a mechanical analysis of the whole process to study the effect of theload of cavitation collapse on the sailing body movement. A new method was established to calculate the load of cavitation collapse, and a whole calculation method on the load of cavitation collapse was established. By comparing the results of numerical calculation with the experiment, the reasonability of the method was validated. Based on it, the law of the load of the cavitation collapse and the shape of the cavitation were obtained. Finally, the effect of elastic vibration on the cavitation collapse was researched, and the elastic vibration had a little effect on the peak value and periods of the collapse load.