The invention discloses an ecological greening road barrier and a water storing processing method thereof. The road barrier comprises a road barrier body, a planting groove and a water storing groove, wherein the planting groove, the road barrier body and the water storing groove are sequentially superposed from top to bottom; a water collecting groove is formed in the inner side wall of the planting groove, and is led to the water storing groove along a water collecting channel in the inner wall of the road barrier body; a water level control hole is formed in the upper side wall of the water storing groove; a functional layer is arranged in the road barrier body, and comprises a substrate layer, a filtering layer, a moisture absorbing and water protecting layer and a supporting plate, wherein the substrate layer, the filtering layer, the moisture absorbing and water protecting layer and the supporting plate are sequentially superposed from bottom to top. Through the adoption of the ecological greening road barrier disclosed by the invention, a road is beautiful, and the ecological benefit is improved; the ecological greening road barrier has a rainwater adjusting function, so that the purpose that plant healthy grow can be guaranteed, and watering cost is saved.