The utility model provides a dual -path electricity supply's high -voltage inverter unit bypass device based on mechanical type contactor, including dual -path electricity supply power supply unit, the bypass drive plate, change formula direct current contactor all the way, it is bypass trouble power unit's executive component to change formula direct current contactor all the way, this contactor contains normally opens two contacts of a normal close, when power unit breaks down, can be effective, , physics excises trouble power unit from connecting fast, the freewheeling diode in the coil of connecting in parallel is arranged in the afterflow of the perceptual electric current of coil. The utility model discloses a dual -path electricity supply mode, the very big reliability that must improve power unit bypass system. Through using conversion type mechanical type contactor, can fundamentally keep apart the trouble unit, improved high -voltage inverter overall reliability. Can realize most trouble bypasses to power unit to can realize the neutral point function of floating.