In order to solve the high salinity, toxic and polluting of ammunition laboratory waste liquid, the waste liquid of ammunition chemical examination was desalinated by electrodialysis. Through the experiment the effect of time and temperature of electrodialysis, material flow on the efficiency of desalination was studied. The experimental results show that the technology used in their laboratory waste liquid electrodialysis desalination processing is feasible, the best temperature for desalination is 30 ℃.