To tackle the double power disturbance problem of a micro-inverter, an AC-side pan Buck-boost power decoupling technique is proposed. Four decoupling circuits designed to achieve bidirectional flow of energy are connected in parallel to the AC side of the inverter. Different topologies can work in Buck, Boost or Buck-boost mode. The four decoupling circuits designed are analyzed in terms of topology, working mode and decoupling performance on the ability of each topology to suppress the second harmonic. The calculation method of a pulse energy buffer is discussed. The simulation results show that the three-mode six-switch Buck-boost power decoupling circuit suppresses the voltage second harmonic effect optimally, and the single-mode six-switch Buck-boost power decoupling circuit suppresses the current second harmonic effect optimally. The pan Buck-boost decoupling technology can greatly reduce the decoupling capacitance value without relying on a large busbar voltage, and realize the electroless capacitor, and improve the reliability of the micro-inverter and prolong its service life. This work is supported by National Natural Science Foundation of China (No. 51467006).