A new structure of the Marx pulse generator for generating bipolar high-voltage pulses is introduced. This structure is composed of a buck-boost converter and connected to a low DC voltage source and several parallel diode-capacitor units. In the first stage, the inductor energy is supplied through the voltage source and in the next stage, the inductor energy is transferred to capacitors. For generating the pulses, voltage polarities of the capacitors are changed by a small inductor which is in resonant with the capacitors. Then, using a fast switch, the capacitors are connected in series to generate desirable high-level pulses. To have bipolar pulses, polarity of capacitors is inverted, alternatively. Modularity of the proposed structure enables us to increase number of the units for generating higher voltage level, straightforwardly.