The utility model belongs to the traveling wave range finding verification technical field and relates to a signal source used for fault waveform simulation. The signal source comprises a power amplification module which comprises an error amplifier, two voltage stabilizing circuits, an N channel MOS pipe, a P channel MOS pipe and a sampling resistor. The output terminal of the error amplifier is in connection with the grid electrode of the N channel MOS pipe through a voltage stabilizing circuit and in connection with the grid electrode of the P channel MOS pipe through the other voltage stabilizing circuit; one end of the sampling resistor is in connection with the anti-phase end of the error amplifier, and the other end is in connection with a connecting line of the source electrodes of the N channel MOS pipe and the P channel MOS pipe. The signal source is used for traveling wave fault waveform simulation and possesses the characteristics of high output frequency and large current.