The invention belongs to the technical field of 
wastewater treatment, and particularly relates to an adsorption device for 
wastewater treatment. The adsorption device comprises an adsorption tank, a working 
barrel, a rotary rod, a liquid inlet 
pipe and a liquid outlet 
pipe, a support rod is fixedly mounted at the bottom of the inner cavity of the adsorption tank, a top cover is fixedly mounted atthe top of the adsorption tank, the working 
barrel is inserted in the adsorption tank, a first adsorption layer is inserted in the top of the inner cavity of the working 
barrel, a second adsorption layer is inserted in the center of the inner cavity of the working barrel, a third adsorption layer is inserted in the bottom of the inner cavity of the working barrel, the first adsorption layer is used for absorbing large 
impurity particles in water, the second adsorption layer is used for absorbing small 
impurity particles in the water, the third adsorption layer is used for absorbing pungent smell and color matter, the liquid outlet 
pipe is used for discharging treated 
wastewater, the situation that impurities in the wastewater 
pile, and consequently the 
adsorption effect is influenced can be prevented, the 
adsorption effect is improved through multi-layer adsorption, the mosaic structure is convenient to 
mount and dismantle, and cleaning is convenient.