The utility model provides an online evacuating device of threshing and redrying blade case and bag, includes the baling press that carries out compaction, pressurize to roast piece cigarette again, the baling press includes pressure head, hydraulic system, setting two guide bars on the pressure head, characterized by: the pressure head is cavity formula seal structure, and the shrouding constitutes jointly bottom pressure head main part and pressure head, is equipped with the vacuum suction passageway in the guide bar, cavity intercommunication in this suction channel lower extreme and the pressure head, and the upper end is linked together through vacuum suction pipeline and vacuum pump, and is equipped with temperature sensor, vacuum meter and filter in this pipeline. Utilize this device reducing incasement cigarette base evacuation, the inside atmospheric pressure of messenger's cigarette base the piece cigarette packing while for moisture can evaporate and take away the heat of cigarette base in the cigarette base in vacuum process, realizes the cooling of tobacco bale, the evacuation makes the covering membrane internal gas pressure reduce, has eliminated cigarette base and plastics covering membrane clearance, and plastics covering membrane inner wall is the regeneration dewfall not to but the inside moisture of cigarette base in the balance box prevents that the tobacco leaf from taking place to milden and rot.