Abstract: A newly designed Z-reinforced foam sandwich composite is introduced. The composite material column is used as the Z-direction reinforcement phase, and the foam sandwich composite materials with different distribution densities in the Z-reinforcement phase are tested. The test is carried out on a flat plate, and its flat pressure performance and failure mode are explored. When the lattice spacing is 30 mm, the density of the sample increases by 2.8%, and the compressive strength and compression modulus are 6.2 and 7.4 times respectively of the original specimen. In addition, the flat crush test simulation for the Z-reinforced foam sandwich composite is established based on the ABAQUS finite element software. The model is used to simulate and analyze its flat pressure performance and failure mode from the perspective of finite element. The deviation between the finite element calculation results and test results of the flat compression strength of the sample is about 10%, and the failure mode is coherent with that of the test, verifying validity of the simulation model.