The invention discloses a topological circuit of a four-order voltage type inverter and a control method thereof. The topological circuit comprises an input circuit, an inverter circuit and an outputcircuit which are sequentially connected from an input end to an output end. The input circuit comprises a first switching device Q5, a second switching device Q6, a first diode D5, a second diode D6,a first inductor L3, a second inductor L4 and a first capacitor C3. The inverter circuit commonly used by the UPS is improved, so that the output waveform of the inverter circuit is more stable, theharmonic content is reduced, and the switching loss is reduced; and meanwhile, a control method based on a state space model is adopted to control the inverter circuit, the convergence speed is high,the error is small, the robustness is high, and the method has positive guiding significance for engineering practice.