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With the increasing demands for mineral resources in China, artificial-source electromagnetic prospecting is playing an increasingly significant role. Consequently, electromagnetic instruments, which are crucial for prospecting, have attracted considerable attention. In order to verify the design targets of a self-developed high-power multifunction borehole-ground electromagnetic transmitting system, field tests are carried out in the mining area of Linxi, in Inner Mongolia. Design targets, including the stability of the current waveform, maximum transmitting voltage, maximum transmitting current, maximum output power, the continuous working time of the transmitting system with high-power output, transmission in single and dual boreholes, and multifunction technical target, have been tested. The test results demonstrate that the proposed system attains the expected design targets, and its performance is excellent. Moreover, the transmitting system can meet the requirements of controlled-source electromagnetic exploration and provide valuable reference for researchers in related fields.