The invention discloses a method for enhancing the adsorption ability of a magnetic adsorbent by using a variable magnetic field. By putting an adsorbent with magnetism into a magnetic field and constantly changing the direction of the magnetic field in an adsorption treatment process, the effect of enhancing the adsorption ability of the magnetic adsorbent can be realized. The method disclosed by the invention has the beneficial effects that the variable magnetic field is used, so as to improve the adsorption capacity of the magnetic adsorbent, increase the adsorption speed and shorten the adsorption time; in addition, by using the stirring action of the variable magnetic field on the magnetic adsorbent, the measures such as traditional processes of shaking table and mechanical stirring can be omitted, further the effects of saving energy and simplifying equipment are realized, and a more efficient processing effect is realized; besides, the method has a broad application prospect in the fields such as environment, energy and medicines.