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In order to shorten the development time of downhole short-distance wireless transmitter, the conventional technical route using commercial arbitrary wave generator is not adopted. A power arbitrary wave generator is specially designed. The host computer downloads waveform data files through USB interface. The signal generator can output up to 6W signal. In order to realize this design, a special-purpose USB-SPI bridge chip is used to complete the communication between host computer and the highly integrated analog front-end (AFE) chip via USB interface. Because the non-real-time operating system of the host computer can not produce stable and high-speed command transmission, the synchronous FIFO is used to store and play back the signals on the SPI bus, which solves the problem of matching the SPI communication rate and enhances the stability of the output update frequency of signal. This power arbitrary wave generator can geneartes 6W, 10-bit, 500 kSa/s arbitrary waveforms with 512 k samples deep memory meeting the design requirements of downhole SDR transmitter. Its analog front-end circuit is exactly the same as the underground transmitter, which realizes one-time hardware development and verification, and shortens the development time.