The present invention discloses a smart elderly-care system. The system comprises an institution elderly-care platform, a community elderly-care platform, and a home elderly-care platform which all are located in the same cloud computing center. The institution elderly-care platform includes an institution server end and a plurality of institution elderly-care terminals; the community elderly-careplatform includes a community server end, a community elderly-care terminal, an elderly terminal connected with the community elderly-care terminal through a 4G mobile network or community network, and a health detection device connected with the community elderly-care terminal through a wireless network; and the home elderly care platform includes a home server end, a sensing device, a health detection device and a plurality of pairs of elderly terminals and monitoring terminals. The system further comprises a supervision terminal and a social terminal which access the institution elderly-care platform, the community elderly-care platform, and the home elderly-care platform through the cloud computing center. With the smart elderly-care system of the invention adopted, the information unification of elderly-care information in a region can be realized, convenience can be provided for the elderly living at home, data support is provided for the integration of the elderly-care information, and convenience is provided for the unified management of elderly care in the region.