The invention relates to the technical field of blowing-type drying boxes, in particular to a molybdenum oxide composite press ball preparation process and a drying device thereof.The drying device comprises a blowing-type drying box main body, a placing structure is connected to the blowing-type drying box main body, and a limiting structure is connected to the placing structure; the blowing-type drying box main body is connected with a bearing structure, the bearing structure is connected with a splitting structure, the blowing-type drying box main body is connected with a protection structure, and the protection structure is connected with an observation structure; molybdenum oxide composite pressing balls can be conveniently placed through the placing structure, under the assistance of the limiting structure, the distances of different specifications can be conveniently adjusted, the placing structure can be conveniently and stably moved into the blowing-type drying box body through the bearing structure, the bearing structure can be disassembled through the disassembling structure when the bearing structure is not needed, and the structure is convenient to disassemble. The protection structure plays a closed protection role, and the interior of the blowing-type drying box body can be conveniently observed through the observation structure.