The invention belongs to the technical field of oil downhole exploration and well logging, and particularly provides a drying agent packaging device. The device comprises a ventilation cover plate, anouter ventilation tube, a bottom ventilation plate and an inner ventilation tube, wherein the outer ventilation tube and the inner ventilation tube are sequentially connected between the ventilationcover plate and the bottom ventilation plate from outside to inside, the ventilation cover plate, the outer ventilation tube and the inner ventilation tube each are provided with a plurality of vent holes, a cavity is formed among the ventilation cover plate, the outer ventilation tube, the bottom ventilation plate and the inner ventilation tube, and a drying agent is arranged in the cavity. According to the drying agent packaging device, the problem that an instrument has potential safety hazards on the well logging safety due to the facts that the instrument is exposed in the environment inwhich the dryness is not up to the standard and the air humanity inside the instrument is difficult to control when the instrument is subjected to various maintenance or repair is solved; and the device not only can prevent fogging phenomenon caused by high inside and outside temperature difference and high internal humidity of pressure-bearing window glass, can ensure that lens can normally observe the well wall, and also has a certain protection effect on a circuit board inside the instrument.