The invention aims to provide a seat mechanism of a walking aid and a walking aid including the seat mechanism. The seat mechanism includes a cushion unit and a seat support unit, wherein the seat support unit includes two telescopic elements which are arranged in parallel, the seat mechanism further includes a first driver which is used for driving the seat mechanism to move forwards and backwards, and a telescopic element connecting member is arranged between the two telescopic elements; and a parallelogram mechanism is formed by the two telescopic elements, the cushion unit and a seat bracket, a parallelogram mechanism is also formed by the telescopic element connecting member, the two telescopic elements and the seat bracket, and stable operation of vertical movement and fore-and-aft movement of the seat mechanism is performed through the parallelogram mechanisms due to expansion and contraction of the telescopic elements and driving of the first driver. The seat mechanism has theadvantages that the seat mechanism has a small volume, the purpose of miniaturization of the walking aid seat is achieved, and easy adjustment is achieved; and meanwhile, hip support of a patient in any posture can be achieved through the walking aid with the seat mechanism.