The utility model provides a grounding body soil association gap discharge route measuring device, belongs to lightning grounding technical field. Its characterized in that: discharge and survey a section of thick bamboo (1) paste and survey a section of thick bamboo (1) inner wall in discharging for the transparent cylinder body of bottom shutoff, zero potential polar plate (5) ring, the gapped filling medium of splendid attire (3) among the annular internal cavity that zero potential polar plate (5) formed, earthing conductor (2) one end is discharged and is surveyd a section of thick bamboo (1) lower part pass through ground connection wire (4) ground connection in vertically inserting clearance filling medium (3). The utility model discloses a measuring device is applicable to high voltage transmission line tower grounding net required test device when designing, being under construction and testing, realize " grounding body soil " make up the discharge path observation in clearance and puncture the radius and measure. Discharging and surveing the whole cylinder that is of a section of thick bamboo, compare in the box of long cubic form, discharging of cylinder surveys the combination discharge gap who constitutes more even in the section of thick bamboo, and discharge path is more average, and the radius that discharges is measured more easily.