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Microplastics (MPs), as reservoirs of cocktail of contaminants, impose severe impacts on human and ambient water environment. Therefore, efficient and eco-friendly MPs removal techniques are urgently needed. In this study, for the first time, magnetic carbon nanotubes (M−CNTs) have been synthesized as adsorbates to remove MPs. M−CNTs were effectively adsorbed on polyethylene (PE), polyethylene terephthalate (PET), and polyamide (PA) and all the MPs/M−CNTs composites were readily separated from aqueous solutions by magnetic force. When the 5 g⋅L⁻¹ of M−CNTs was added, target MPs (5 g⋅L⁻¹) were completely removed within 300 min. The maximum adsorption capacities of PE, PET and PA were 1650, 1400 and 1100 mg-M−CNTs⋅g⁻¹, respectively. This process was hardly affected by the COD, NH₃-N, and PO₄ ³⁻ substance and all MPs were completely removed from the wastewater …