The utility model discloses a slice medium treatment device, including frame, setting transfer passage, paper feed mechanism, at least one alignment board in the frame to and switching mechanism, paper feed mechanism sets up in transfer passage same one side along the direction of height including the compression roller subassembly and the drive roll that lie in the relative both sides of transfer passage respectively, compression roller subassembly, alignment board and switching mechanism, and switching mechanism is connected with the compression roller subassembly and the board that aligns respectively, and switching mechanism drive alignment board when the compression roller of drive compression roller subassembly withdraws from transfer passage gets into transfer passage. Compared with the prior art, the utility model discloses a slice medium treatment device is little along transfer passage width direction's structure size, consequently is favorable to the miniaturized design of equipment.