This study proposes a high-security and large-capacity optical encryption scheme based on multi-channel perfect high-dimensional Poincaré beams (HDPBs) generated through cascaded metasurfaces. By cascading two arrayed metasurfaces, more beam properties can be independently engineered, which significantly expands the key and encoding spaces. The proposed method utilizes the infinite modes of HDPBs and the scalability of arrayed metasurfaces to achieve a large information capacity and high security level. The encryption process involves encoding information into five independent parameters of HDPBs, which are then decoded using RCP/LCP analyzers. The results demonstrate that the proposed method can generate multi-channel perfect hybrid-order Poincaré beams (HyOPBs) and HDPBs with various topological charges and polarization states. The generated HDPBs can be manipulated by adjusting the phase differences between co-polarized and cross-polarized channels of the metasurfaces. The encryption system is implemented by encoding information into two arrayed metasurfaces, which are then aligned to generate the desired HDPBs. The decryption process involves retrieving the parameters of the HDPBs and translating them into digital forms using a look-up table. The results show that the proposed method can securely encrypt and decrypt information with high capacity and security. The study highlights the potential of cascaded metasurfaces for optical encryption and the application of Poincaré beams in optical communications and quantum information.This study proposes a high-security and large-capacity optical encryption scheme based on multi-channel perfect high-dimensional Poincaré beams (HDPBs) generated through cascaded metasurfaces. By cascading two arrayed metasurfaces, more beam properties can be independently engineered, which significantly expands the key and encoding spaces. The proposed method utilizes the infinite modes of HDPBs and the scalability of arrayed metasurfaces to achieve a large information capacity and high security level. The encryption process involves encoding information into five independent parameters of HDPBs, which are then decoded using RCP/LCP analyzers. The results demonstrate that the proposed method can generate multi-channel perfect hybrid-order Poincaré beams (HyOPBs) and HDPBs with various topological charges and polarization states. The generated HDPBs can be manipulated by adjusting the phase differences between co-polarized and cross-polarized channels of the metasurfaces. The encryption system is implemented by encoding information into two arrayed metasurfaces, which are then aligned to generate the desired HDPBs. The decryption process involves retrieving the parameters of the HDPBs and translating them into digital forms using a look-up table. The results show that the proposed method can securely encrypt and decrypt information with high capacity and security. The study highlights the potential of cascaded metasurfaces for optical encryption and the application of Poincaré beams in optical communications and quantum information.