The utility model relates to a wall air-conditioner, belonging to air conditioning field, in particular to an improved air conditioner which can be fixed on the wall. The utility model resolves the problem that the currently window air conditioning extends the window and the outer chamber of the detachable climatic chamber is hung on the wall, therefore destroys the compatibility and the beauty of the building. The technical proposal of the utility model is that the compressor, the condenser, the radiator, the evaporator and the air-cooler are arranged in order from up to down to a whole which is a narrow, high and thin cube shape and can be fixed on the wall conveniently. The lower part of the utility model has a thermovent arranged outside and the upper part has an intake arranged inside. The two parts of the air conditioner can be arranged on different walls respectively if necessary. A water cooling device and a noise damping apparatus are arranged in the air conditioner. The utility model is suitable for using in households and business buildings.