The invention discloses an adsorption tank specially used for a spray dryer, which relates to the field of drying granulation equipment. The adsorption tank includes a cylinder body used for accommodating an adsorbent and equipped with openings at both ends; both ends of the cylinder body are provided with end covers for sealing the cylinder body; contact surfaces between the end covers and the cylinder body are respectively provided with annular sealing rings; the end covers and the cylinder are fixed by a plurality of connecting nails; the two end covers are connected with ventilation connecting pipes extending into the cylinder body; and the two ventilation connecting pipes are arranged in a staggered manner. The adsorption tank provided by the invention is the adsorption tank speciallyused for an energy-saving and environmentally-friendly waste heat utilization device of the spray dryer, is used for adsorbing solvents and harmful substances in a hot exhaust gas to avoid pollutingenvironment, at the same time, the content of the solvents in the hot gas is reduced, the adsorption tank is more conductive to drying materials, and enables the drying efficiency to be improved; andthrough arrangement of a structure of the adsorption tank, the adsorbent is easily replaced, the adsorption effect is ensured, and regeneration, recovery and utilization of the adsorbent are convenient.