The invention discloses a damper double-color injection molding structure for an automobile air-conditioning case assembly. The damper double-color injection molding structure comprises a damper body formed by hard plastic and a sealing strip which covers the periphery of the damper body and is formed by soft plastic; a hard plastic connection part is arranged on the periphery of the damper body, a soft plastic connection part is correspondingly arranged on the sealing strip, the hard plastic connection part and the soft plastic connection part are both arranged to be of a step-type cantilever structure, and the hard plastic connection part and the soft plastic connection part are connected in a matched mode. The connection parts of the damper body and the sealing strip are both arranged to be of the single-step type cantilever structure, and compared with an original two-side covering mode, the structure of the connection parts is simpler; on the premise that the connection strength between the damper body and the sealing part is guaranteed, the structure of a mold used for molding of the damper structure is simpler, the molding technology is simplified, and the molding difficulty is reduced.