A new process of microforming metal foil by cavitation water jet impact was presented, the high pressure impact load generated by cavitation water jet bubble collapse was used to realize the microforming of metal foil. Using ANSYS/LS-DYNA numerical simulation method, TA2 titanium foil with a thickness of 100 μm was taken as the research object to study the microforming performance of cavitation water jet impact.By establishing model, defining material and properties, defining element type and contact, dividing mesh, boundary conditions and loading of force, numerical simulation was carried out on the forming morphology of titanium foil and the movement of the center point of the forming part, which provided a basis for further experimental research on the micro-forming mechanism of cavitation water jet impact.