Single-phase three-level flying capacitor(TLFC) boost inverter is a power converter with active power decoupling without requiring additional components, which has attracted much attention. This paper proposes a new active power decoupling control method for the TLFC boost inverter. This method can effectively suppress the double-line-frequency ripple in the input current and the bus voltage while performing a good dynamic response under power and grid disturbances. Finally, a 1.5-kW hardware prototype is built to validate the effectiveness of the proposed control method.