The invention discloses a triode trigger circuit based low interference electric leakage detection system which comprises a probe (A), a control chip (U), a triode (VT1), and a capacitor (C3) with its positive pole connected with the RE pin of the control chip (U) and negative pole the DIS pin of the control chip (U). According to the invention, it is possible to process the signals outputted by the probe to make the frequency of the signals more stable, and suppress the interference signals in the level signals, making the system free of the influences of interference signals and greatly improving the detection precision. At the same time, the system can quickly start an NE555 integrated chip, increasing the detection speed.