In order to analyze the impulse characteristics of tower grounding device under continuous lightning impulse, continuous impact tests of typical grounding bodies with different soils, materials and shapes are carried out. Under continuous pulse impact, with the increase of impulse time interval, the secondary impact grounding resistance increases from the lower value at soil breakdown to the single pulse impact grounding resistance. However, within a certain time interval, the secondary impulse grounding resistance of grounding device in soil with less water content is significantly greater than that of single pulse impulse. The secondary impulse grounding resistances of grounding bodies with different shapes and materials are different. In the tower grounding design, the increase of impulse grounding resistance under continuous lightning impulse needs to be considered, and the material and shape of grounding body should be comprehensively considered. Based on the experimental results, the ATP Draw simulation modeling method of tower grounding system under continuous lightning impulse is proposed. This method achieves good effect when simulating the spark effect of impulse grounding and the recovery process of soil resistivity after soil breakdown.