A modularized and distributed parallel battery direct current system is disclosed and comprises a secondary equipment room direct current system module and a 110 kV and 10 kV power distribution devicedirect current system module, and a bus coupler switch is arranged between direct current buses of the secondary equipment room direct current system module and a 110 kV and 10 kV power distributiondevice direct current system module. Each of the secondary equipment room direct current system module and the 110 kV and 10 kV power distribution device direct current system module comprises a plurality of parallel connected intelligent battery assemblies, a direct current monitoring system module and an intelligent feed line unit, wherein one end of each intelligent battery assembly is connected with the direct current buses while the other end is connected with an alternating current power distribution unit, the direct current monitoring system module is connected with the direct current buses, and the intelligent feed line unit is connected with the direct current buses. Modularized and distributed approximation-based distribution is adopted for the direct current system disclosed inthe invention, storage batteries are connected in parallel in an indirect manner, an application amount of direct current cables can be greatly reduced, rates of direct current insulation faults can be lowered, and power supply reliability of the direct current system can be improved.