Coupling linkage variable-posture anti-subsidence bionic foot and coupling linkage walking wheel

The invention provides a coupling linkage variable-posture anti-subsidence bionic foot and a coupling linkage walking wheel. The coupling linkage variable-posture anti-subsidence bionic foot comprises bionic foot single bodies. Each bionic foot single body comprises a bionic tarsal and metatarsal bone unit, a bionic tarsal and metatarsal bone tendon unit and a bionic toe unit; each tarsal and metatarsal bone imitating unit comprises a vertical rod and an elastic component; the toe-imitating unit comprises a second toe, a third toe, a fourth toe, a left web and a right web; the tarsal and metatarsal bone tendon imitating unit and the elastic component are arranged on the vertical rod in a sleeving mode, and the lower end of the vertical rod is connected with the toe root of the third toe. The elastic component is positioned between the tarsal and metatarsal bone tendon imitating unit and the toe root of the third toe; the tarsal and metatarsal bone tendon imitating unit can rotate and move up and down along th