The dual power supply cabinet is provided with two power supply incoming line switches and an automatic transfer switch. Under normal circumstances, one power supply as the main power supply for the load power, the other power supply as a backup power in the hot standby state. When the main power supply fails (such as power failure, abnormal voltage, etc.) , the switch will automatically or manually switch the load to the standby power supply, so that the load can continue to obtain power supply, so as to achieve uninterrupted power supply. The power distribution box is equipped with indicator light to display circuit status, circuit breaker to realize circuit protection and controller to realize operation outside the cabinet, etc. .