In this work, a compact wideband circularly-polarized (CP) metasurface (MS) antenna is proposed, which is composed by one novel 4×4 cross-layer polarization dependent metasurface (PDMS) structure and a slanted coupling slot fed through the microstrip line. The cross-layer PDMS structure is constructed by loading several lower-patches along one dimension of the conventional square upper-MS structure. Besides, these lower-patches are located below the gaps of upper square patches directly. Distinct with conventional square MS structure, the proposed cross-layer PDMS structure can exhibit different reflection features in two orthogonal dimensions. Besides, these lower-patches also can provide a large cross-layer capacitive loading to miniaturize the size of MS. By properly tailoring the phase difference of the PDMS structure between the two orthogonal dimensions and combining with a slanted coupling slot, the PDMS structure can be used as a radiator to realize circular- polarization states. Accordingly, a circularly-polarized MS antenna based on the proposed PDMS structure is designed, exhibiting a large 3-dB axial ratio (AR) of 25.5% (6.6~8.53GHz), a large -10dB impedance bandwidth of 42.02% (5.62~8.61GHz) within a much compact aperture size (0.4λ 0 ×0.4λ 0 ).