Damper and walking-aid robot

The invention belongs to the technical field of rehabilitation medical instruments, and particularly relates to a damper and a walking aid robot, wherein the damper comprises a hydraulic rod, the hydraulic rod extends into a hydraulic cylinder from the tail end of the hydraulic cylinder, a sealing ring connected with the inner surface of the hydraulic cylinder is arranged at the inner end of the hydraulic rod, a free piston and a first compression spring are arranged between the sealing ring and the fixed end of the hydraulic cylinder, two ends of the first compression spring are respectively abutted against the free piston and the fixed end, the free piston and the sealing ring jointly divide the space in the hydraulic cylinder into a first cavity, a second cavity and a third cavity, liquid is respectively arranged in the second cavity and the third cavity, a first through hole communicating the second cavity and the third cavity is formed in the sealing ring, and a flow regulating device for controlling the flow rate of the liquid flowing through the first through hole is arranged. The adjustable damping device has adjustable damping, provides larger supporting force, and converts the gravitational potential energy of the body and the elastic potential energy of the first spring into each other.