The utility model relates to a waterweed maintenance device for an artificial wetland. The ecological embankment comprises an embankment body, a soil layer arranged in the embankment body, a water layer located above the soil layer and a plurality of protection boxes arranged in the soil layer. The protection box comprises an outer box and an inner box arranged in the outer box, a plurality of first through holes are formed in the side wall of the inner box, the first through holes are arranged in a rectangular array, second through holes corresponding to the first through holes in position are formed in the side wall of the outer box, and the diameter of the second through holes is larger than that of the first through holes; sliding grooves are vertically formed in the four corners of the interior of the outer box, sliding strips matched with the sliding grooves are vertically arranged at the four corners of the exterior of the outer box, and the sliding strips drive the inner box tovertically slide along the sliding grooves. A positioning rod is movably arranged in the first through hole and is horizontally arranged, the two ends of the positioning rod are each provided with adisc-shaped limiting piece, and the diameter of each limiting piece is larger than the inner diameter of the first through hole and smaller than the diameter of the second through hole. The aquatic plant protection device has the effect of improving the aquatic plant protection capacity.