The invention discloses a system for purifying eutrophic water employing artificial flow aeration coupled to a biological film floating bed. The system comprises biofilm colonization, a floating bed, and artificial flow aeration, wherein a biofilm colonization carrier is a soft fiber filler, and is combined with the floating bed to form a biological film floating bed unit; the artificial flow aeration is that a plurality of push flow aerators arranged below the biological film floating bed unit are started towards the same direction to form circulating flow water, and supply oxygen to the water. The system adopts a plurality of biological film floating bed units, which are fixed by an anchor stake, connected by a connecting rod, and arranged in an oval shape; a guide wall is arranged in the middle; the push flow aerators are arranged below the floating bed. Compared with the common biological film floating bed, the artificial flow aeration is increased, the water mobility is enhanced, an independent aeration system does not need to be arranged, the removal efficiency of pollutants are high, the water eutrophication degree can be effectively relieved, and the operation mode can be regulated and controlled according to the dynamic change of water temperature and water quality, and the system is more stable, efficient and energy-saving in operation.