The invention discloses a drying box. The drying box comprises a drying box body. The upper part of the drying box body is provided with a heating device. The upper part of the inner side of the drying box body is provided with mixed flow fans. The drying box body is internally provided with a conveyor belt. One end of the upper part of the drying box body is provided with a feed port. The other end of the drying box body is connected with a separating box. The side wall of the separating box is provided with an air blower, and an outlet of the air blower is obliquely upward. The lower part ofthe separating box is provided with a first discharge port and a second discharge port. The upper end of the separating box is provided with an air outlet, and the position of the air outlet is provided with a filter net. The drying box has the beneficial effects that when the drying box is used for drying materials, air of the mixed flow fans flows transversely and longitudinally, and evaporation of water of the materials is accelerated; and the separating box can further separate the materials not conforming to the technical requirements, and the product quality is guaranteed.