The invention provides a roadway air-tight door, a roadway wind wall and preparation methods thereof. The roadway air-tight door comprises a hollow flexible mold bag corresponding to the roadway cross section, the outer periphery of the flexible mold bag is fixed on the periphery of the inner wall of the roadway, a foam concrete wall body is casted in place in the flexible mold bag, and casting holes for the entry of foam concrete and air outlets for the discharge of gas are correspondingly formed in the upper end of the flexible mold bag; and an exit for the access of people is arranged on the bottom of the foam concrete wall body, and an air-tight door is hinged to the exit. According to the roadway air-tight door, the roadway wind wall and the preparation methods thereof, the foam concrete wall body is adopted as the air-tight door, the whole body is casted and molded, and no gap is left on the wall body; and the foam concrete can be closely adhered to the inner wall of the roadway when casting, so that no gap exists between the molded wall body and the inner wall of the roadway, and the seal performance is good.