Adsorption device and adsorption method

The invention discloses an adsorption device and an adsorption method. The adsorption device comprises an adsorption chamber, at least two adsorbers, a cleaning station and a switching device, wherein liquid is fed into the adsorption chamber from a first liquid inlet, when the liquid flows through the adsorbers, impurities in the liquid are attached to the adsorbers, and then the liquid subjected to adsorption and filtering flows out of a first liquid outlet; and after one adsorber adsorbs impurities, the switching device is adopted for switching the adsorber from the adsorption chamber to the cleaning station, and after the other adsorber is switched to the adsorption chamber, a cleaning device is adopted for cleaning the adsorbers. The cleaning station and the adsorption chamber are independently arranged, and the cleaning process of the adsorber does not take up the impurity adsorption time, so that the iron removal efficiency is greatly improved; and the device is simple in structure, easy to control and convenient to maintain.