A multiphase inverter circuit and a modulation method thereof. The multiphase inverter circuit is configured for generating a target alternating current power based on a direct current power provided by a DC power supply, and the multiphase inverter circuit includes at least one non-interleaved inverter circuit; the non-interleaved inverter circuit includes: a first bridge arm unit, a second bridge arm unit, and an inverting coupling transformer. When the first pulse signal and the second pulse signal with a phase difference pass through the inverting coupling transformer, a current loop can be formed within the non-interleaved inverter circuit so that the body diodes of the power transistors conduct before the power transistors conduct, thereby reducing the reverse recovery power consumption of the body diode of the corresponding power transistor and realizing zero-voltage soft switching.