The utility model provides an outer hanging aquatic plant plants groove, joins externally on the revetment wall body, and it includes, the stores pylon, its frame construction is including the under(-)chassis and connect the both sides frame of its both sides, the opposite flank of both sides frame is followed length direction and is offered the guide slot, establishes the locating part in the guide slot, the connecting portion that can join externally on the revetment wall body are established at side frame frame top, plant the groove, it is upper portion open-ended box, and at least one hole of permeating water is established to the bottom, respectively establish a pulley about in the middle of the outer wall of box both sides, the planting groove is inlayed through the pulley and is reciprocated in the stores pylon guide slot to the locating part is spacing in receiving the guide slot. The utility model discloses can join externally in the stereoplasm revetment, not destroy revetment barricade structure, utilize buoyancy, can adjust the height by oneself according to the water level, carry out the purification of certain degree to the water, decorate the stereoplasm revetment to the plant can the normal growth when guaranteed water level changed.