Abstract: Aimed at the lower separation effect of wet magnetic separator,this paper first introduced the magnetic separator structure and work process,and then analythzed the impact of the various factors on the separating results,and proposed a technological transformation programme,Finally,carried on the comparation of the technical indicators and the analysis of economic efficiency,made a conclusion that the 1,800,000 /a.of washing coal cost be saved by adpoting the technological transformation programme for the xinxing separation plant.