The utility model discloses a flow guide device for pneumatic drying. The flow guide device comprises an expansion section and a drying lifting section which are connected, and the drying lifting section is a perpendicular section. The flow guide device is characterized in that the expansion section is integrally formed by a horizontal section and an arc section, and the arc section is arranged on the tail end portion of the expansion section, and is inclined upwards to guide to the perpendicular drying lifting section. A guide plate extending to the perpendicular drying lifting section from the horizontal expansion section in the prior art is eliminated, the physical functions of the guide plate are displaced to the expansion section, that is, the expansion section with a certain radian is connected with the drying lifting section, the expansion section has the function of expanding cut tobacco, and meanwhile has a certain guide function, and therefore the problem that the moisture content of a tobacco pneumatic drying outlet is large in fluctuation can be obviously solved.