The utility model discloses a preliminary treatment is unloaded ash can and is prevented and kill off dirt ash device that hardens sets up the fluidization device in unloading the grey warehouse of unloading of ash can, the ash hole side of unloading grey warehouse is installed to the fluidization device, the fluidization device includes a fixing bolt, the last two nuts that sets up of fixing bolt, the mounting panel by two nuts and fixing bolt link into an integrated entity, fixing bolt's upper portion set up the axial air vent and with the radial hole of axial air vent intercommunication, fixing bolt's top still sets up the air cap. The utility model has the advantages that: can effectively avoid hardening, keep row ash smooth and easy.