The invention relates to a flash dryer air outlet tube used for a lab. The flash dryer air outlet tube comprises a tubular body and a plurality of air outlet holes distributed in the side wall of the body. The side wall of the body comprises at least two corrugated areas distributed in the circumferential direction, the side wall extends in a corrugation shape in the axial direction of the body in any corrugated area to form a plurality of peak parts, a plurality of trough parts and connecting parts, wherein the peak parts and the trough parts are arrayed at intervals in the axial direction of the body, the adjacent peak parts and trough parts are connected through the connecting parts, and the connecting parts tilt relative to the axial direction of the body. The air outlet holes are formed in the connecting parts, the axes of the air outlet holes are obliquely downward, and the included angle between the axis of each air outlet hole and the axial direction of the body is an acute angle. According to the flash dryer air outlet tube, the connecting parts between the peak parts and the trough parts in the corrugated areas of the side wall provide arrangement positions tilting relative to the axial direction of the air outlet tube body for the air outlet holes, in this way, the axes of the air outlet holes are obliquely downward, air flows are guided at a certain tilt angle to the side wall of a container to be dried, and downward pushing force is exerted on water drops attached to the wall of the container in cooperation with the own gravity of the water drops, so that the water drops fall off rapidly, and the drying process is accelerated.