Wet type coarse grain preselector

The utility model discloses a wet-type coarse grain preselector, which belongs to the field of ore screening, and comprises a support frame, a preselection box is arranged on the support frame, a support column is arranged on the support frame, the support column penetrates through the preselection box, the preselection box is rotatably connected with the support column, and the preselection box is arranged on the support column. The end, located in the pre-selection box, of the supporting column is sleeved with an electromagnet, a cleaning brush is arranged in the pre-selection box and abuts against the inner side wall of the pre-selection box, and an opening and closing assembly for controlling feeding of the pre-selection box is arranged on the pre-selection box. A first driving assembly used for driving the preselection box to rotate is arranged on the supporting frame, and a second driving assembly used for driving the cleaning brush to move is arranged on the preselection box. The cleaning device has th