The invention discloses a driving circuit of the signal source of a fish finder transmitter, and belongs to the field of fishing aid equipment. The circuit is arranged between the output end of the signal source and a load, comprises an MOS tube driving subcircuit, a D-type half bridge power amplification subcircuit and an LC series resonance subcircuit, and is used for amplifying the output powerof the signal source and filtering out high-frequency noise to restore an output signal, and providing the signal source with amplified power for the fish finder transmitter to drive the load. According to the driving circuit of the signal source of the fish finder transmitter, it is unnecessary to use a bipolar power supply to provide power, and it is only necessary to provide power through a simple unipolar positive power supply to output amplified period sine waves alternately positive and negative in a restored mode; the half bridge power amplification driving circuit is adopted, only a small number of components are needed, the layout space can be saved, each unit of the system is small in size, single board integration is easy, the cost is low, and the cost of the whole system circuit is reduced; by means of flexible dead zone control over circuit design, crack and explosion of an MOS tube can be effectively prevented, and the stability of the circuit is greatly improved.