The invention discloses artificial water weeds for water ecological restoration and application thereof. The artificial water weeds mainly comprise water weed fibers, a main rope, floats and a bottom anchoring part, wherein the water weed fibers are made of modified polylactic acid fibers; the bottom anchoring part is connected with the water weed fibers by virtue of the main rope; and multiple floats are uniformly distributed on the main rope, so that the artificial water weeds for water ecological restoration form an upright shape in water. Because the biodegradable polylactic acid fibers with biological affinity and hydrophilcity serve as artificial water weed materials, rapid biofilm culturing can be realized, and the biomass is increased. Meanwhile, the artificial water weeds are gradually and naturally degraded; on the one hand, a carbon source is provided for attached microbes, and the water quality purification effect is enhanced; on the other hand, self-degradation is realized, and later-stage white pollution is alleviated.