The invention discloses a diode expansion boost type inverter circuit and relates to the technical field of power electronic inversion with an aim to increase boost coefficient of single-stage boost type inverters. The diode expansion boost type inverter circuit is formed by a diode expansion boost network, an inverter bridge, a broadband converter, a zero-setting integrator, a compare trigger module, a vector allocation module, a microprocessor and a drive circuit; the diode expansion boost network comprises an input direct-current power source Uin, a diode D1, a diode D2, a diode D3, a diodeD4, an inductor L1, an inductor L2, an inductor L3, a capacitor C1 and a capacitor C2. The diode expansion boost type inverter circuit has the advantages of high boost coefficient, high reliability,continuous input current, low switching loss and flexible control, and the diode expansion boost type inverter circuit is suitable for occasions with low input voltage and wide range of variation.