The invention provides a rapid GIS equipment gas leakage non-power stop quantitative detection method based on a helium tracer. The method comprises steps that certain-amount helium is filled into a GIS gas chamber till the helium volume percent is tao; the relationship between the reading of a utilized vacuum helium mass spectrometer and a helium gas leakage rate is calibrated; the vacuum heliummass spectrometer starts for leakage detection work; a vacuum helium mass spectrometer probe is utilized to move along the surface of detected equipment; suspected leakage points are searched according to the apparatus response time and the probe moving speed, and the probe is made to sequentially stop at the suspected points and different positions nearby the suspected points; a probe suction inlet points to leakage points, the helium leakage rates of the leakage points are detected, the readings tend to be stable are recorded, and averaging is carried out; the leakage rate of the helium is reckoned. The method is advantaged in that quantitative detection on the leakage rate is carried out on the condition that local packaging is not carried out, the quantitative leakage detection time isshortened, and a problem that local packaging is required for quantitative gas leakage detection existing in GIS equipment in the prior art is solved.