Small space debris impact the surface of spacecraft frequently at a velocity of about 10 km/s, thereby creating plasma cloud clusters during the impact. If the impact happens in the area with high voltage, then the plasma can induce discharge. This mechanism of spacecraft discharging has been widely accepted but research about it is rare. In this paper we present the experimental results of 200 micron glass ball particles impact induced discharge carried out on a plasma drag small space debris accelerator. The experimental results and characteristics of the discharging signals are also analyzed in this paper.