The invention relates to the field of air conditioners, in particular to an air conditioner. The air conditioner comprises a middle frame structure, wherein the middle frame structure is provided with a panel; the panel is connected with the middle frame structure through a telescopic connecting device; the panel is provided with an opening device stretching forwards and a closing device covering the middle frame structure after being taken back; a gap formed between the panel and the middle frame structure when the panel is opened is used as an air inlet; an air outlet is also formed in the side edge of the middle frame structure; an air guide baffle structure which is capable of prolonging an air outlet air duct is arranged between the air inlet and the air outlet. According to the air conditioner disclosed by the invention, the air outlet air duct can be prolonged through the air guide baffle structure, so that air outlet airflow is separated from air inlet airflow, cold and hot gases are not easily mixed, and the defect of low working efficiency caused by mixing of the cold and hot gases in an air inlet of a traditional wall-mounted air conditioner is overcome; meanwhile, the air guide baffle structure is rotationally arranged on the air outlet according to the shape of the air outlet, the design is ingenious, and the appearance and the shape are attractive.