The invention discloses a buffering and damping device for a treadmill. The buffering and damping device comprises a rack, a running belt, support blocks, a base, a lower guide roll I, lower connecting rods I, a middle guide roll I, upper connecting rods I, an upper guide roll I, a movable base, an upper groove I, an elastic buffer plate, an upper groove II, an upper guide roll II, upper connecting rods II, a middle guide roll II, a lower guide roll II, lower connecting rods II, a lower groove II and a lower groove I. The buffering and damping device has the advantages that the structure is reasonable and simple, the production cost is low, the mounting is convenient, and the lengths of the lower connecting rods I, the upper connecting rods I, the upper connecting rods II and the lower connecting rods II are the same, thus the tightness of the running belt is not influenced when the movable base downwards moves for realizing damping, namely, the effect that the running is not influenced during damping is guaranteed; and in addition, due to the additional arrangement of the elastic buffer plate, the micro impact force generated during running can be buffered, moreover, due to elastic telescopic rods arranged between the movable base and the base, certain damping can be realized on the movable base, and meanwhile, the effect that only damping through vertical movement of the movable base can be realized is guaranteed.