Provided is a humidity-discharging ballistic cap for a curing barn. To be specific, the utility model relates to a humidity-discharging device, especially to a humidity-discharging device for a thermal insulation layer of a curing barn. The humidity-discharging ballistic cap is formed by a humidity-discharging channel and a cloth curtain; the humidity-discharging channel is arranged at the top end of the thermal insulation layer and the end of the humidity-discharging channel is a 90-degree corner and is used as a humidity-discharging outlet; and the cloth curtain is connected at the top end of the humidity-discharging outlet and a balancing weight is connected at the bottom of the cloth curtain. According to the utility model, because bricks are used to build the wind cap, on one hand, economy and durability are realized; and on the other hand, the bricks have the moisture absorption function, thereby preventing mildew. Besides, the cotton cloth and the iron wire can be found conveniently; the manufacturing and installation of the cap can be carried out conveniently; and the long service life is long. Moreover, with the utilization of the humidity-discharging ballistic cap, the operation of a humidity-discharging window is not needed to be considered during the whole tobacco leaf curing process and a natural humidity-discharging state is formed, so that the labor intensity of farmers is reduced and security of working high above the ground can be ensured.