The prebuilt 10 kV DC-DC (240 V / 336 V) power supply system for data center is integrated with 10 kV power distribution, transformers, uninterruptible power supply and the output power distribution unit, has high power density and high efficiency and is safe and reliable. Also, the System deploys modular expansion and a single set can provide power supply for up to 2.4 MW IT load, which precisely meet the core demands for engineering productization, rapid deployment, super efficiency, and intelligence by the future data center.