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This paper reports a design of embedded exciter based on ARM Cortex-M3 Microcontroller and QDUC, in order to deal with the problem of traditional exciter system, for example it has large volume, higher cost, and so on. The design using the ARM Cortex-M3 microcontroller, Ethernet PHY and uIP TCP/IP protocol stack to build a wired network achieving data communication with the extern host control node. The system can generate arbitrary waveform RF excitation signal, by means of quadrature digital upward frequency conversion employing the baseband data received from the Ethernet using the QDUC ASIC. The design has the features of excellent adaptability to environment, small size, simple structure, easy to design, credible performance, strong scalability. Experiments show that the maximum available baseband data updating rate can be reached in UDP working mode is 21.5Mbps, and the RF signal carrier frequency covers the range of DC to 400MHz, which can meet the requirements of the project.