The work aims to clarify coupling vibration mechanism between flip-flow screen panels and moist fine coal material group containing agglomerates. Firstly， the ejection velocity and the maximum impact force of the single agglomerate or material particle colliding with the screen panel are derived through theoretical calculations. Then， the screening process co-simulation model of the moist fine coal material group containing agglomerates on nonlinear screen panels is constructed， and the effectiveness of which is verified by an experiment. Finally， the influence of vibration parameters on the coupling dynamic characteristics between material group and screen panels are analyzed by co-simulations. Results show that the ejection velocity and the maximum impact force of the single agglomerate or material particle are jointly decided by factors including the restitution coefficient， the installation inclination angle， the vibration amplitude， the vibration frequency， and the vibration angle. During the stable screening process， the beat vibrations of screen panels are caused by the nonlinear time-varying excitation of the material group， and particles average normal velocities are directly related to the vibration frequency and amplitude of the screen panels. The screening efficiency and production ratio of the material group can be properly improved by increasing the vibration frequency of screen panels. The research provides a reference for the screening performance improvement and the optimal working g value determination of the flip-flow screen.