The invention discloses an impact characteristic measurement correction method for a grounding device, and the method specifically comprises the following steps: 1, employing grounding electrodes arranged around the grounding device at equal intervals as backflow electrodes; 2, selecting potential reference points on the backflow electrodes; 3, obtaining impact grounding impedance in a mode of a correction coefficient, and measuring the impact grounding impedance, wherein the correction coefficient is solved based on an actual measurement soil model. The method employs the grounding electrodes arranged around the grounding device at equal intervals as the backflow electrodes, and guarantees the uniform distribution of disperse flow of the grounding device towards the surroundings. The method does not need to arrange the backflow electrodes remotely, so the testing is convenient. Meanwhile, an impact current generator is easier to generate a large current. The method obtains the impact grounding impedance in the mode of the correction coefficient, and the correction coefficient is solved based on the actual measurement soil model. While guaranteeing the uniform distribution of disperse flow of the grounding device towards the surroundings, the method achieves the more accurate measurement of the impact grounding impedance.