The utility model relates to a vibrating structure of an electric toothbrush,The system includes a shaft rodA swinging rodA fixed part and a vibrating rod,The shaft rod has a first end and a second end,The first end is driven by a driving force to drive the shaft rod to generate vibration,One end of the swinging rod is correspondingly inserted at the second end of the shaft rod,A counterweight is provided at the other end of the swinging rod,The counterweight system is eccentrically arranged so that the swing rod is out of balance and deviates from a central axis of the shaft rod,The fixed part is sleeved on the swinging rod and is arranged between the shaft rod and the counterweight,A first space is formed inside the vibrating rod,The shaft rod is correspondingly arranged in the first space,The fixed part is in contact with the inner part of the vibrating rod.一種電動牙刷的振動結構，係包括一軸桿、一擺動桿、一固定件及一振動桿，該軸桿具有一第一端及一第二端，該第一端受到一驅動力以帶動該軸桿產生振動，該擺動桿一端係對應插設於所述軸桿之第二端，於該擺動桿之另一端設有一配重塊，該配重塊係呈偏心設置以使該擺動桿產生失衡偏離該軸桿的一中心軸線，該固定件套設於該擺動桿上並設於該軸桿及該配重塊間，該振動桿內部形成一第一空間，所述軸桿對應設置於該第一空間內，並令所述固定件與該振動桿之內部相接觸。
