The invention discloses an electric car recharge billing control unit and a working method thereof. The electric car recharge billing control unit includes a CPU processor, a measurement billing module, a coordinate positioning module, an external expansion memory, a card reader, a display screen, a keyboard, a voice module, an RTC clock and a power failure detection module; the measurement billing module and the CPU processor communicate with each other; the CPU processor is connected to the external expansion memory, the card reader, the display screen and the keyboard through communication interfaces; the CPU processor is connected to a coprocessor through a high speed data channel; the coprocessor and a safe chip module are connected through an SPI bus; and the measurement billing module issues acquired electricity energy information to the CPU processor through a communication interface. The electric car recharge billing control unit can effectively ensure data security of a user, and can enhance the compatibility and the promotion of recharge facility operation.