The invention discloses a connecting circuit for an energy storage super capacitor bank in an intelligent maintenance-free direct current power system. The connecting circuit comprises an alternating current/direct current (AC/DC) constant current voltage limiting charger, a DC/DC direct current converter, a running energy storage super capacitor bank C and a connected energy storage capacitor bank GC, which are connected in parallel. The connecting circuit also comprises two groups of diodes, wherein each group of diodes consists of two diodes which are connected in series; nodes between first and second diodes in the two groups of diodes are connected with the anode of the running energy storage super capacitor bank C and the anode of the connected energy storage super capacitor bank GC in parallel; the anodes of the first diodes in the two groups of diodes are connected to the anode A of the AC/DC constant current voltage limiting charger; and the cathodes of the second diodes in the two groups of diodes are connected to the input end anode P of the DC/DC direct current converter. The connecting circuit has the advantages that the connected energy storage super capacitor bank with voltage inconsistent with that of the running energy storage super capacitor bank in the direct current power system can be directly connected to the circuit to realize uninterruptible direct current power supply.