Armrest lock structure with damping function and seat

The handrail lock structure with the damping function comprises a fixed part, a rotating part, a connecting shaft (1) and a damping spring (2), the connecting shaft (1) is connected with the rotating part, the fixed part and the rotating part are connected in an axial limiting mode, the rotating part can rotate relative to the fixed part and can be locked with the fixed part at a preset position, and the damping spring (2) is arranged between the connecting shaft (1) and the fixed part in a sleeved mode. In the connecting shaft (1) and the fixing piece, the first one is fixed with the damping spring (2), the second one is capable of rotating relative to the damping spring (2), the damping spring (2) is in a radial tensioning state, the second one is locally provided with a limiting groove (1a), the damping spring (2) is provided with a protruding part (2a), and when the seat armrest is in a storage position, the protruding part (2a) is clamped in the limiting groove (1a) and can be separated from the limiting