The invention relates to the field of window type air conditioners, in particular to a light window type air conditioner. The light window type air conditioner comprises an evaporator, a condenser and two air guide assemblies, wherein the evaporator is arranged at the indoor end of a base plate; the condenser is arranged at the outdoor end of the base plate; the two air guide assemblies are arranged between the evaporator and the condenser in parallel. A compressor is transversely arranged between the two air guide assemblies. Each air guide assembly comprises a driving motor, a fan, a wind wheel and a volute, wherein the two ends of the driving motor are provided with power output shafts; the first power output shaft is connected with the fan, and the second power output shaft is connected with the wind wheel; the wind wheel and the driving motor are arranged in the volute; an air inlet of the volute faces the evaporator; an air outlet of the volute faces indoor air outlets formed in the sidewall of a shell. Indoor-side air inlets are formed in the position, facing the sidewall of the shell, of the evaporator. The sidewall and the top wall of the shell are provided with outdoor-side air inlets. The outdoor-side air inlets are located in the rotating surfaces of fan blades. The sidewall of the air outlet end of the shell is provided with outdoor-side air outlets. The compressor of the light window type air conditioner is arranged between the two air guide assemblies. The length of the evaporator/the condenser is increased. The air-conditioning capacity and energy efficiency are improved.