Abstract: In view of the rigid power allocation, poor thermal management, and high upgrading costs inherent in traditional integrated DC charging piles, a distributed DC charging station control system with a “rectifier cabinet + multi-terminal” architecture was proposed and developed. Hardware-wise, an STM32F429 microcontroller was utilized as the primary control unit, a baseboard integrating regulated power supply, condition monitoring, and safety protection circuits was fabricated, and a hybrid communication network consisting of dual redundant CAN buses and RS-485/RS-232 interfaces was established to facilitate real-time data exchange among the rectifier cabinet, charging terminals, and battery management system (BMS). Software-wise, modular coding principles were adopted, and functions including self-checking, user identification, billing management, and dynamic power scheduling based on the soft actor-critic (SAC) algorithm were implemented. The SAC-based strategy was devised to coordinate dynamic power distribution over the whole station under a global power cap. The experimental results demonstrate that the designed control system can stably support data interaction among the rectifier cabinet, charging terminals, and BMS, while maintaining constrained flexible power allocation under multi-vehicle concurrent access scenarios. Under the test condition with four terminals randomly connected and a station-level power upper limit of 240 kW, the system is shown to achieve dynamic coordinated power allocation while satisfying safety constraints, with the communication links remaining stable throughout the process. This system is expected to provide a valuable technical reference for the engineering design and intelligent operation and maintenance of high-power charging stations.