Abstract: The invention discloses a semi-airborne time domain electromagnetic exploration system for an unmanned aerial vehicle, and belongs to the technical field of geophysical electromagnetic exploration. The system comprises a ground high-power electromagnetic field source emission subsystem, a semi-airborne time domain electromagnetic exploration and observation subsystem and a data processing interpretation software subsystem, wherein the ground high-power electromagnetic field source emission subsystem comprises an IGBT full bridge, a PWM control circuit, a rectification filter circuit and a protection circuit; the semi-airborne time domain electromagnetic exploration and observation subsystem comprises an unmanned aerial vehicle, a receiving coil and a receiver; the data processing interpretation software subsystem comprises a system function module and a bottom layer supporting module, and the bottom layer supporting module is used for providing a universal performance function for the system function module.