Disclosed is a piezoelectric oscillating device, which comprises a multi-section guiding component and an oscillation generating component, the multi-section guiding component including a plurality of guiding units, each guiding unit having a hollow space, the plurality of guiding units being connected together along a longitudinal direction in such a manner that the hollow spaces are connected in series to form the multi-section guiding component, and a guiding channel is formed inside the multi-section guiding component by connecting the plurality of hollow spaces in series, the oscillation generating component including a housing unit and a piezoelectric component, the housing unit being connected to an end of the multi-section guiding component in the longitudinal direction, the piezoelectric component being disposed in a disposing space in the housing unit and oscillating via a control of a piezoelectric signal.