Abstract: Continuous glass fiber/polypropylene (GF/PP) composite corrugated sandwich panels with different laminates were prepared in this paper. The effects of different panels and core materials on the mechanical properties of corrugated sandwich panels were studied, including flat compression and bending properties. The results show that under the same panel, increase the thickness of the core board can greatly increase the overall flat-pressure performance of the sandwich panel. Under the same board, the method of laminating the panel has certain influence on the flat pressure performance of the sandwich panel. The corrugated sandwich panel with 0° and 90° layers has the highest flatwise compression modulus of 59.55 MPa, while the overall flatwise compression properties of those panels with the same layers cannot be increased significantly by only increasing panel thickness. The panel lay-up method has a great influence on the bending performance. The corrugated sandwich plates with 0° outer layer have the highest transverse bending modulus of 783.66 MPa, while the corrugated sandwich plate with 90° outer layer have the highest longitudinal flexural modulus of 732.09 MPa. However, for the panels with the single layers(0° or 90° layers), the bending property along a certain direction of sandwich panel will be a short board.