The invention discloses a sine wave inversion system. The sine wave inversion system is characterized by mainly consisting of a processing chip U, a transformer T, a capacitor C1 with an anode as an input end and a grounded cathode, a resistor R5 connected in series between the anode of the capacitor C1 and a VCC pin of the processing chip U, a resistor R6 connected in series between the anode of the capacitor C1 and a VC pin of the processing chip U, and the like. According to the invention, an SG3525AJ integrated chip is employed as the processing chip, the system is controlled by use of a pulse width modulation mode, energy consumption of the system itself is greatly reduced, and the conversion efficiency reaches 94% or more.