In order to meet the dual needs of the new generation of pure electric vehicles for charging speed and system intelligence, this paper designs and implements an embedded charging power controller for DC slow charging scenarios. The system is based on STM32F4 series microcontrollers, adopts modular hardware architecture, integrates voltage sampling, CC interface recognition, S signal regulation, CAN/RS485/LoRa and other multi-channel communication modules and fault bypass mechanisms, and has multi-stage charging process control capabilities and multi-communication adaptation capabilities. The main control program adopts the joint control mode of hierarchical scheduling and state machine to realize real-time identification and dynamic scheduling of charging status. In terms of circuit design, the system schematic is managed through multi-level hierarchical management, combined with a compact layout of two-layer PCBs, to ensure signal integrity and system stability. The test results show that the controller has good performance in charging stage identification, command response, communication coordination and fault isolation, which is suitable for current and future diversified DC charging needs, and has good engineering application value and expansion potential.