The invention discloses a tobacco curing barn with a diversion structure. The tobacco curing barn comprises a tobacco loading chamber (1) and a heating chamber (2), wherein a heating device (5) is arranged in an upper cavity (3) of the heating chamber (2); the tobacco loading chamber (1) and the heating chamber (2) are separated by a heat insulating wall (6); an air return opening (7) is formed in the upper part of the heat insulating wall (6), and is used for communicating the tobacco loading chamber (1) and the upper cavity (3); an air supply outlet (8) is formed in the lower part of the heat insulating wall (6), and is used for communicating the tobacco loading chamber (1) and the lower cavity (4); a axial flow fan (9) is arranged between the upper cavity (3) and the lower cavity (4); and a diversion plate (10) is arranged in the lower cavity (4), and is inclined toward the bottom of the air supply outlet (8). According to the tobacco curing barn, hot wind blasted from the axial flow fan is buffered and enters the tobacco loading chamber from the air supply outlet due to the arrangement of the diversion plate, so that air in the tobacco loading chamber is uniform and the tobacco curing quality is guaranteed.