Online intelligent relay device for direct-current storage power supply of equipment

A primary coil of a transformer of the device is connected with a mains supply through a power switch, a secondary coil of the transformer is provided with a five-stage voltage tap, and the input end of a five-gear change-over switch is connected with the five-stage voltage tap. The input end of the rectifier is connected with the output end of the five-gear change-over switch and the tail end of a secondary coil of the transformer, and the filter capacitor, the direct-current voltmeter, the light-emitting diode, the voice prompter and the resistor are sequentially connected in series and then connected to the output end of the rectifier in parallel. After the current regulator and the direct-current ammeter are connected in series, two ends of the current regulator and the direct-current ammeter are respectively connected with an output end anode of the rectifier and an anode of the voltage distributor, and a cathode of the voltage distributor is connected with an output end cathode of the rectifier; and the