The invention discloses a lifting and descending machine and belongs to the technical field of air-conditioners. The lifting and descending machine comprises a front face plate, a side face plate anda decorating plate. The decorating plate comprises a first buckle and at least one second buckle. A front face plate locating hole is formed in the front face plate. At least one side face plate locating hole is formed in the side face plate. The first buckle is inserted in the front face plate locating hole of the front face plate and can move in the front face plate locating hole. The second buckles are inserted into the side face plate locating holes and can move in the side face plate locating holes. The decorating plate is fixed to the front face plate and the side face plate. When assembly deviation occurs to the front face plate and the side face plate, by adjusting the position of the first buckle in the front face plate locating hole, and the positions of the second buckles in theside face plate locating holes, the influence caused by the assembly deviation in the decorating plate installing process can be avoided, and normal installing of the decorating plate is achieved.