Abstract: A vibration device with a controllable undulation height is provided, comprising: a lower hood, and a motor is fixedly connected to a bottom of an inner cavity of the lower hood, and the inner cavity of the lower hood is provided with a vibration mechanism; the vibration mechanism comprises two support seats, and the two support seats are symmetrically distributed and fixedly connected to the lower hood, an inside of a support seat is provide with a synchronization connecting rod, and the synchronization connecting rod penetrates the support seat and is movably sleeved with the support seat, an end of the synchronization connecting rod is fixedly connected with an eccentric bearing, and a synchronization wheel is arranged outside the synchronization connecting rod, the synchronization wheel is arranged outside the synchronization connecting rod and is movably sleeved with the synchronization connecting rod, a belt is arranged outside the synchronization wheel.