The invention discloses a symmetric transmission type driving power source for a power system fault detecting device. The symmetric transmission type driving power source is characterized by mainly comprising a diode rectifier U, a nonlinear trigger circuit, a main quartz crystal oscillator circuit, an auxiliary quartz crystal oscillator circuit and a power logic voltage stabilizing circuit; the nonlinear trigger circuit is connected with the diode rectifier U, the main quartz crystal oscillator circuit and the auxiliary quartz crystal oscillator circuit are connected with the nonlinear trigger circuit, and the power logic voltage stabilizing circuit is arranged between the diode rectifier U and the nonlinear trigger circuit in a serial connection manner; the power logic voltage stabilizing circuit comprises a power amplifier P1, an AND-NOT gate IC1, an AND-NOT gate IC2, an AND-NOT gate IC3, an AND-NOT gate IC4, an N (negative) pole and the like, and the N pole is connected with an output end of the power amplifier P1. The symmetric transmission type driving power source has the advantages that the power logic voltage stabilizing circuit and the nonlinear trigger circuit are creatively combined with each other, accordingly, circuit structures can be greatly simplified, radio frequency interference of the circuits and external radio frequency interference can be reduced, and the manufacturing cost and the maintaining cost can be greatly lowered.