The invention discloses a cabinet air conditioner. The cabinet air conditioner comprises: a housing module open on a front side thereof, wherein air inlets are formed in a left sidewall, a right sidewall and a rear sidewall of the housing module, respectively; a heat exchanger module, wherein a cross section of the heat exchanger module is U-shaped, and the heat exchanger module is arranged on an inner wall of the housing module; an air duct module located within the housing module and fixed on a front sidewall of the heat exchanger module; an electric control module arranged on the inner wall of the housing module and located on a lower portion of the air duct module; and a front housing module. According to the cabinet air conditioner of the present invention, on one hand, a heat exchange area between the heat exchanger module and air can be increased favorably so that the heat exchange efficiency can be improved, and therefore, refrigeration and heating effects of the cabinet air conditioner can be improved; on the other hand, the cabinet air conditioner is simple to assemble, and further, the time of assembling is saved and the working efficiency of a worker is improved.