To meet the requirements for atmospheric pressure low-temperature plasma excitation, a compact all-solid-state bipolar pulse adder with nanosecond edges is developed. It uses two PNP MOSFETs with their source terminals shorted to form a special half-bridge circuit, and each stage includes two such half-bridge circuits and one capacitor. One bipolar signal applied to both gates of these two PNP MOSFETs can control both their switching. Combined with magnetic isolated driver with primary windings in series, one bipolar signal from the primary side can synchronously drive many charging and discharging switches, which considerably reduces the number of required components in the drive circuits. This greatly simplifies the structure of the pulse adder. A test prototype was constructed and the test results were demonstrated. The designed bipolar pulse adder can generate repetitive bipolar nanosecond pulses with voltage up to ± 8 kV, a pulse width of 0.3–5 μs, and pulse edges of around 45 ns. Finally, the bipolar pulses of ± 6 kV and 1 kHz were applied to drive a plate-plate dielectric barrier discharge reactor and intense dielectric barrier discharges were excited. The size of the power circuit in this bipolar pulse adder is 14.5 × 5 × 7 cm, and its weight is 220.8 g, which is very compact.