A novel magnetically hyper-cross-linked polymer (Fe3O4@HCP-NH2) was prepared in this study, which combined the advantage of the amino-modified HCP-NH2 and the magnetic Fe3O4 nanoparticles. The Fe3O4@HCP-NH2 composite has a high specific surface area (532.62m(2)g(-1)), well-developed mesoporous (0.3786cm(3)g(-1)) and good magnetic property. This Fe3O4@HCP-NH2 composite exhibits excellent adsorption ability for tetracycline, and the maximum adsorption capacity calculated by Langmuir model at 298K is up to 694mgg(-1). The adsorption mechanisms could be attributed to the complexation interactions, hydrogen bonding and cation exchange, and the dominant interaction was the surface complexation which was elucidated by X-ray photoelectron spectroscopy analysis. In addition, the composite can be rapidly separated and maintains high adsorption performance after five regeneration cycles. More importantly, it can be used as a broad-spectrum and highly efficient adsorbent for organic contaminants including methyl orange, methylene blue, bisphenol A and 2,4-dichlorophenol removal from contaminated water. This work demonstrated that the Fe3O4@HCP-NH2 composite would be the most promising candidates for application in the adsorption of organic pollutants.