Abstract: To accurately evaluate the fracture-crossing-layer behavior of shale reservoirs during hydraulic fracturing, an interfacial plastic sliding dynamic model is extended to hydro-mechanical coupling analysis to address the deficiency in calculation accuracy of conventional mechanical models that neglect bedding-plane sliding. A full hydro-mechanical coupling constitutive relation accounting for irreversible sliding is established using the local cohesive element method. Numerical simulations are performed on large-scale models with multiple horizontal beddings, and the influences of geological and engineering parameters on fracture-crossing-layer propagation are systematically analyzed. The results show that the internal friction angle of bedding planes serves as the core factor governing hydraulic fracture crossing-layer behavior; a larger internal friction angle facilitates fracture crossing, whereas cohesion exerts a minor effect. Under identical in-situ stress difference, lower absolute in-situ stress favors fracture crossing. Both increasing injection rate and fracturing-fluid viscosity can promote fracture crossing. It is also revealed that when hydraulic fractures encounter a bedding zone composed of multiple bedding planes, fractures may be captured and diverted along subsequent bedding planes due to insufficient propagation conditions, even if they have crossed several preceding bedding planes. The research outcomes provide a more reasonable mechanical model and theoretical reference for the evaluation of fracture-crossing-layer performance in hydraulic fracturing.