Abstract: In order to more effectively reduce medium consumption in coal preparation plants, experimental study is conducted with the currently used HDMA-6 counter-current wet drum magnetic separator, with angle of magnetic system and recovery rate of magnetic matters as test factor and indicators, respectively. As indicated by test results, within the testing range, despite the fact that a high recovery of magnetic matters of around 98% on average can be obtained at different angels of the magnetic system, there still exist some differences in the recovery rate when the angle varies; the magnetic system should be most preferably set at an angle of 10° for clean coal / middling magnetic separator and set at angle of 5° for refuse magnetic separator, and, in this case, the two separators can respectively see a rise of recovery rate by 0.23 and 0.24 percentage points as compared with the case that the angle remains at an unchanged state of 0. The research findings can help improve the efficiency of magnetic separator from a long-term point of view.