Multifunctional lower limb exoskeleton

The multifunctional lower limb exoskeleton comprises a hip joint, a knee joint, an ankle joint, a thigh assembly and a shank assembly, the hip joint is movably connected with the knee joint through the thigh assembly, the knee joint is connected with the ankle joint through the shank assembly, and the knee joint comprises a thigh connecting part and a shank connecting part which are rotationally connected; the multifunctional lower limb exoskeleton further comprises a walking assisting device arranged at the knee joint, the walking assisting device comprises a spring arranged between the thigh connecting part and the shank connecting part, the walking assisting device further comprises a plurality of plug pin holes formed in the knee joint, plug pins are detachably arranged in the plug pin holes, and when the plug pins are located in the plug pin holes, the plug pins penetrate through the spring. The walking assisting device is arranged at the knee joint, when a user walks, the knee joint is bent firstly, mea