The invention discloses a prefabricated combined-type road barrier for a greening road. The prefabricated combined-type road barrier comprises a connecting body, a road barrier body and a plantation pot. The top of the connecting body is equipped with an inverted convex groove. During application, the plantation pot can disposed at the upper part of the inverted convex groove. The lower space of the plantation pot is a water storage trough. A bottom board of the plantation pot is equipped with a water leakage hole which can be used for penetrating and inserting water-absorbing fiber rods. Upper parts of the water-absorbing fiber rods are located in an inner cavity of the plantation pot. Lower ends of the water-absorbing fiber rods are located at the bottom of the water storage trough. Multiple overflow pipes are upwardly arranged at the bottom of the water storage trough at certain distance. The overflow pipes are connected with plantation grooves, upwardly and downwardly penetrate through the road barrier body and finally reach a water passing hole. The prefabricated combined-type road barrier for the greening road is simple in structure so as to ensure stability, firmness and integrity. Additionally, green plants can be planted. Therefore, noises can be effectively reduced. Exhaust gas and dust can be absorbed, thereby beautifying the environment. Life quality of people and city images can be enhanced.