In order to improve the pretreatment of marine aquaculture wastewater, and reduce the scale and energy consumption of subsequent water treatment equipment, a continuous flow electrocoagulation (EC)-filtration pretreatment system was designed to investigate the influences of anode materials, hydraulic retention time (HRT) of EC reactor and filtration pore size on its water treatment capacity. It was found that the removal rate of EC on chemical oxygen demand (CODMn) increased with the addition of the Fe electrode proportion in the anode, and the effect was significant (P < 0.05). The anode materials had no significant effect on the removal of total nitrogen (TN) (P > 0.05). The pH of water decreased during EC. Compared with Al or Fe anode, when Al-Fe compound electrode was used as anode, the system could better remove COMMn and TN. In addition, with the increase of HRT and the decrease of filtration pore size, the removal rate of the system on CODMn and TN increased. When HRT was 4.5 min, anode was 2Al+2Fe and filtration pore size was 45 μm, the removal rate of the system on CODMn and TN was the highest, respectively (53.02±0.74)% and (58.90±1.96)%, the energy consumption was (31.35±0.6)×10-3 kWh/m3, and the dissolution rate of Al anode and Fe anode was (0.11±0.01) mg/s and (0.05±0.00) mg/s respectively. The study showed that EC-filtration system had fairly good removal effects on CODMn and TN, and ECcould significantly enhance the treatment efficiency of subsequent filtration equipment.