The Cu-FeOx@AC composite catalyst, recyclable Cu-Fe bimetallic oxides, was prepared to explore the new algal treatment technology in eutrophic water. Hydrothermal method and high-temperature calcination method were used to make Cu-FeOx loaded on the surface of granular activated carbon. Then, the composite catalyst was characterized by XRD, SEM, FTIR and XPS. At the same time, the effects of Cu-FeOx loading ratio to AC, amount of PMS, initial pH and different reaction systems on algae removal were studied, and the effects of Cu-FeOx@AC activated PMS system on algae removal were studied. Free radical shielding experiments and XPS analysis were carried out to explore the reaction mechanism of Cu-FeOx@AC activated PMS system. The experimental results showed that when the initial pH is 6, the initial algae concentration is 1.4×109 L-1, the catalyst dosage is 0.2 g·L-1, and the PMS dosage is 0.5 g·L-1, the degradation rate of algae can reach 97.25% in 90 min. In this reaction system, algal cells can be adsorbed on the face of Cu-FeOx@AC. Under the valence conversion between the Fe and Cu, and the synergistic reaction of AC, the holes, 〖"·O" 〗_"2" ^"-" , "·OH" ,〖" SO" 〗_"4" ^"·-" and singlet oxygen could be produced by composite catalyst, to remove the algal cells.