Power supply switching device for avoiding non-stop of unit and monitoring method

The invention relates to the technical field of electrical engineering transformation, in particular to a power supply switching device and monitoring method for avoiding non-stop of a unit, and the device comprises a power supply monitoring unit which is used for monitoring the voltage, frequency, phase sequence and phase difference of a main power supply; the control unit judges the state of the main power supply according to a preset interaction rule and formulates a switching strategy; a switching execution unit; the power supply switching device is more intelligent, stable and reliable, supports remote monitoring and management, improves user experience and convenience, introduces intelligent algorithm, remote control and fault diagnosis functions, enables equipment to automatically optimize switching strategies, remotely monitor and diagnose faults, reduces requirements of manual operation, reduces downtime and loss, and meanwhile, improves working efficiency. By recording the duration time of the power