The invention discloses a hot air mixed flow vertical dryer and a homogenous drying process. The hot air mixed flow vertical dryer comprises a hot air furnace, a reversing mechanism and a drying box, wherein the hot air furnace is communicated with the drying box through an air channel I and an air channel II to form a loop; the drying box comprises a box body, a main air channel, a lower air channel air-distributing plate located at the lower part of the drying box, an upper air channel air-distributing plate located at the upper part of the drying box, more than one material trays I and more than one material trays II. Through improvement of the structures of the air-distributing plates and the material trays and the operation control of the humidity elimination mode, the air inlet direction and the air outlet direction, the problem of nonuniformity of drying can be effectively improved; the dryer is simple in structure and convenient to operate; the nonuniformity of drying of agricultural byproducts is improved; the drying time can be reduced; the energy consumption can be reduced; the product quality of the material can be improved.