The invention discloses a bottom dryer with a vertical air control device. According to the bottom dryer, hot air blown out by a drying device can be partially recycled to an air inlet fan, in this way, cold air is preheated before being heated equivalently, partial heat can be recycled, and energy consumption is reduced; and the cold air on the outer side can be blocked through a vertical air guiding plate, thus air can only enter the drying device from the upper portion of the drying device, and in this way, the influence of the outside cold air on the drying efficiency is eliminated.