The invention provides an inter-well connection quantitative evaluation method based on complex nonlinear injection-production modeling. The method comprises following steps: S1: extracting static geological features and dynamic production features after reading production dynamics data and well trajectory data, and establishing a dynamic connectivity model using hierarchical clustering coarse-grained classification; S2: sorting the calculation results of the dynamic connectivity model by the characteristics of turbulence channels between large-scale fractured wells, and diving the dynamic connectivity model into several branches; S3: determining the size relationship of turbulent channel characteristics between large-scale fractured wells of several production wells on the same connectedbranch, and constructing a static parameter inequality constraint matrix in each type; S4. using the inequality constraint matrix to modify the fluctuating complexity feature to obtain the injection and production split coefficient, and evaluating the inter-well connectivity degree through the injection and production split coefficient. The beneficial effects of the present invention: through thecomplex nonlinear injection-production modeling based on the combination of static and dynamic characteristics, the injection-production split coefficient is obtained to quantify the connectivity between wells.