The utility model relates to a multipath power failure, power recovery and phase loss automatic alarm device, which is mainly composed of a detection power access unit, a multipath circuit state detection and power failure detection unit, a power failure alarm output unit, a power recovery alarm detection unit, a power recovery alarm output unit, a sound-light alarm module, and a normal power supply, power failure and power recovery operating state indicating unit. The multipath power failure, power recovery and phase loss automatic alarm device is characterized in that the detection power access unit comprises a rack type distribution box which connecting multiple power supplies to be detected and a UPW power supply of an alarm, and the rack type distribution box is internally provided with an embedded three-position power socket and an air switch equipped with a 4p and three 2ps. The multipath power failure, power recovery and phase loss automatic alarm device is reasonable in structural composition and simple to operate, and has the characteristics that the system gives out sound-light alarm automatically when power failure or phase loss occurs in one or more paths of multiple power supplies, and the system also alarms automatically when the power supply recovers, and the like.