A piezoelectric transformer driving device includes a piezoelectric transformer for outputting an alternating high voltage, a switching control part configured to control the control frequency of the control signal, a reference voltage waveform generation part configured to switch between a first voltage value, a second voltage value and a third voltage value, a monitor voltage generation part configured to generate a monitor voltage waveform based on the high voltage output from the piezoelectric transformer, and a comparison part configured to compare the reference voltage waveform with the monitor voltage waveform to generate a comparison result, and configured to supply the comparison result to the switching control part.