<p>The grounded-source transient electromagnetic method features large detection depth and high resolution, requiring the transmitting system to have high-current and high-resolution performance. Currently, international mainstream transmitting systems that excite the earth by transmitting step square wave signals have limitations in both detection depth and accuracy. Adopting pseudorandom coding transmission waveforms is beneficial for improving excitation performance. This paper conducts the design and development of a high-power transient electromagnetic signal transmitter system based on pseudorandom coding. An independent waveform generation module is used to produce arbitrary coded transmission waveforms based on square waves (basic waveforms), which are compatible with bipolar square waves of different duty cycles, pseudorandom coded waveforms, multi-frequency coded waveforms, etc., and drive the transmitter to achieve waveform output. The system employs a double AC-DC rectification + H-bridge inverter topology circuit. Through phase-shifted full-bridge soft-switching rectification conversion technology and high-precision synchronous coding technology, it realizes high-power transmission of selected waveforms. After completing the prototype development, experiments such as low-power code pattern effectiveness testing and high-power code pattern power testing were carried out to verify the generation of drive signals and the output performance of actual signals. The research results of the arbitrary coded waveform transmitter will provide technical support for promoting the development of the transient electromagnetic method.</p>