The utility model discloses an on - -spot calibration equipment of built -in superfrequency transducer sensitivity of GIS, including pulse generator and superfrequency partial discharge detector, utilize the low pad control coaxial cable of first section to be connected pulse generator's signal output part with the signal end that sets up the first built -in superfrequency sensor in gas insulationswitch, adopt pulse generator to pour into pulse signal through the low pad control coaxial cable of first section into to first built -in superfrequency sensor, utilize the low pad control coaxial cable of second section to be connected the signal end of the built -in superfrequency sensor of the second signal input part with superfrequency partial discharge detector, messenger pulse signal transmits in gas insulation switch to partial discharge detector detects by the superfrequency. The utility model discloses can reflect the operational environment and the sensitivity of on -the -spot built -in superfrequency sensor really, the safe operation of guarantee power equipment, its is simple to use, the effect is showing, has high popularization and application and worth.