The invention provides an energy-saving intelligent check-up all-online direct-current charging and discharging system. The system comprises a host computer terminal, a gateway, an integrated monitor, a first charging device, a second charging device, a third charging device, a sub-monitor, a data collector, a first inversion power source, a second inversion power source and a third inversion power source; the host computer terminal is connected with the integrated monitor through the gateway; the integrated monitor is connected with the first charging device, the second charging device and the third charging device through a bus; the sub-monitor is connected with the data collector, the first inversion power source, the second inversion power source and the third inversion power source through an RS485 bus; the data collector, the first inversion power source, the second inversion power source and the third inversion power source are connected in parallel; and the first charging device, the second charging device, the third charging device and the sub-monitor are connected in parallel. The energy-saving intelligent check-up all-online direct-current charging and discharging system of the invention has the advantages of convenient use, energy-saving performance, environmental friendliness, automatic voltage equalization and high safety, and can assist in decreasing labor input.