A cross-joint-segmental elastic assistive device comprises: at least a pair of mutually isolated and opposite separators, such separators respectively having a shield face and a contact face, an elastic connector extending along an elastic force direction and having at least an elastic active section and fixed connection sections respectively located on the both sides of the elastic active section, with each of the fixed connection sections individually being connectedly fixed to one of the separators and a plurality of fixers connectedly fixing the fixed connection sections of the elastic connector respectively to the separators.
