The application discloses switch board and capacitor bank spare thereof, switch board include capacitor bank spare, and wherein capacitor bank spare still includes including having the condenser that at least two plays electricity was held: the junction box, the junction box with the play electricity end corresponding connection one by one of condenser, every the junction box all has first link and second link, first link with the play electricity end of condenser is connected, the second link has at least two and is used for supplying wire male plug wire hole, the wire with plug wire hole looks fastening connection. The occupation space of junction box is little to can reduce holistic occupation space, simultaneously, the wire one -to -one is installed in the plug wire downtheholely, can be so that install and examine and repair, moreover the junction box of same model can be installed to the play electricity end of condenser to can improve overall structure's regularity.