The invention discloses a cabinet air conditioner, which comprises a shell opened with air outlets, a lifting panel moving along a guide rail positioned at the internal side of the air outlet and air supply vanes arranged in the air outlet; wherein, a left and a right air supply vanes are arranged in front of an upper and a lower vane; a baffle piece baffling the guide rail in rotary is positioned at one side of the guide rail. By arranging the rotating baffle piece and rotating to facilitate the baffle piece to shade the guide rail of the lifting panel after opened the lifting panel, the invention enables the dust uneasy to be invaded into the air conditioner during operation, thereby reducing the sediment of dust and improving the lifting stability of the panel and prolonging the operating service life. Besides, by utilizing the front and the rear surfaces of the baffle piece to guide the direction of the air discharged, the invention enlarges the angle for supply air and improves the comfort of the air conditioner.