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The application discloses a kind of local vortex structure quantitative analysis methods for optimizing the performance of biomimetic submersible, belong to underwater biomimetic robot technical field.The method of the present application comprises, first based on the numerical calculation of flow field is carried out based on the immersed boundary method, obtains overall flow field data;Then according to the geometric characteristics and function of biomimetic body Preset division local analysis area;Finally, the contribution of each area to overall hydrodynamic force is calculated using quantitative formula based on vortex dynamics.The method solves the problem that the existing technology has space dimension reduction, grid is not suitable for large deformation motion and cannot complete time-varying analysis, quantifies the contribution of local vortex structure of key parts to water power at each moment, establishes the quantitative space-time mapping relationship between local vortex structure and stress, realizes the quantitative connection from flow field micro mechanism to engineering optimization design, provides accurate and reliable quantitative analysis tool and decision basis for deep understanding of biological propulsion mechanism and implementation of targeted performance optimization of biomimetic submersible.