A massage head unit, a vibration assembly and a smart wearable device, including: a soft rubber base plate, a plurality of vibrating members, a plurality of soft rubber massage heads, and a plurality of soft rubber pleated bodies capable of stretching and deforming in a axial direction of each massage head; the base plate, the pleat bodies and the massage heads are integrally molded by injection molding, the base plate is provided with a plurality of through holes penetrating therethrough, and the through holes, the pleated bodies and the massage heads are in one-to-one correspondence, each massage head is provided with a mounting cavity mounted with at least one vibrating member, each pleated body is connected to a bottom of the massage head and an edge of the through hole, such that each of the massage heads is floating and supported on the edge of the through hole.