The work aims to promote the rational use of square self-filled honeycombs by studying the change rules of their out-of-plane plateau stresses with impact velocity, ratio of cell wall thickness to side length and self-filling order. ANSYS/LS-DYNA was used to establish the finite element model based on cells array for the out-of-plane impact analysis of square self-filled honeycombs. The out-of-plane compression test and corresponding simulation analysis were carried out on the square honeycomb with self-filling order of 0 to prove the reliability of the finite element model. Based on the simplified super folded element theory, the theoretical quasi-static plateau stress model of square self-filled honeycomb was established and verified by the simulation results. The square self-filled honeycomb higher dynamic plateau stress with increasing ratio of cell wall thickness to side length and impact velocity. When the self-filling order changed from 0 to 1, the growth rate of the dynamic plateau stress was the largest. When other factors are fixed, the out-of-plane dynamic plateau stress of square self-filled honeycomb has a linear relation with the square of velocity and a power function relation with the ratio of cell wall thickness to side length, and the growth rate decreases gradually with increasing self-filling order. Based on the finite element simulation, the empirical formulas of dynamic plateau stress are obtained for the square self-filled honeycomb with different self-filling orders.