The invention discloses a medical rehabilitation walking aid. The walking aid comprises a base, universal wheels, a vertical fixing frame, a guiding rail, a locking bolt, a movable base, a connectingshaft, a movable seat board, a seat cushion, a push hand frame, a telescoping transfusion frame, a horizontal fixing frame, armrest frames, fixing blocks, a movable frame, connecting pieces, safety belts, a lumbar protective band, a rotating shaft and a handle. The walking aid has the advantages that the structure is reasonable and simple, the production cost is low, installation is convenient, and functions are complete; a patient walks into the walking aid and fixes the lumbar protective band to the lumbar region, and by means of the movable frame, not only is it convenient for the patient to enter the walking aid, but also the patient can be in a closed environment after the movable frame is put down; during walking, firstly, the patient gets up and fixes the safety belts into the connecting pieces, and then rehabilitation training can be conducted by the patient through the walking aid; by squeezing a holding rod and pressing compression springs, the hand is gradually exercised, and by rotating an adjusting bolt, an adjusting board is adjusted, so that the compression degree of the compression springs is controlled, and then the exercise intensity is controlled.