A bionic joint device with closed lubrication comprises a main body bionic bone (1), a driven bionic bone (4), an elastic easily-stretching cavity housing (2), a cavity sealing hoop (3), an elastic shock-proof material (5), a high-strength wear-resistant self-lubricating material (6) and a powerful inelastic limit connection (7). The elastic easily-stretching cavity housing (2) is internally filled with lubricating grease (8). The device is applicable to the robotics field and the artificial joint field.
