The PV module produces a specific input power under light conditions, while the output power contains pulsations at twice the industrial frequency. In order to reduce the adverse impact of high-frequency ripple, reduce the bus capacitor voltage asymmetry and the power circuit volume. Thus, a novel active power decoupling micro-inverter without split bus capacitors is proposed. Similar to conventional micro-inverter, it effectively suppresses common-mode leakage currents. Unlike traditional micro-inverters, it utilizes two switches instead of splitting the bus capacitor. The proposed inverter realizes the optimization of the conventional structure, reduces overall structural size, increases the power density of the inverter, extends the input voltage range, and improves the overall lifetime. The novel topology is built in PSIM software platform, and the simulation result is consistent with the assumption and conforms to the harmonic standard requirement. The effectiveness of the novel topology is verified through simulation.