Separation and recovery is the previous process of reuse of discarded or obsolete explosives.According to the differences of the melting points of TNT, RDX and Al powder, TNT was separated by pressure differential filtration with water as the heating medium from the discarded or obsolete TNT/RDX/Al explosive.And the properties of explosive before and after separation were studied.Results show that the safety and efficiency of separation process are improved, and the recovery rate of TNT is 76.2%, and the purity of reclaimed TNT is 94.46%.The peak temperature on DSC curve for the melting process of reclaimed TNT is 81.0 ℃.The main impurities in reclaimed TNT are RDX in the eutectic system TNT-RDX.