Photovoltaic energy is a clean, economic, sufficient and safe energy. The photovoltaic energy generation inverter based on MSP430 is specially designed for photovoltaic energy generation. According to instability of sun illumination, protecting circuits and feedback control circuits are added. By tracking the maximum power point, solar energy is exploited efficiently. After being processed by inverting circuits, commutating and filtering circuits, a stable voltage of 220 V is output. Characteristics of master control chip MSP430F149 are introduced. Software and hardware structures for system design are given.