Cold exchange system of indoor unit of air conditioner

The utility model discloses a cold exchange system of an indoor unit of an air conditioner. The cold exchange system comprises an air conditioner box, a cold exchanger and a fan. The center of the air conditioner box is provided with a cavity; two end faces of the air conditioner box are provided with a first air inlet and a first air outlet; both the first air inlet and the first air outlet are communicated with the cavity; the cold exchanger is mounted within the cavity and located behind the first air inlet; the fan is mounted within the cavity and located behind the cold exchanger; the fan is provided with a second air inlet and a second air outlet; the first air outlet is tightly connected with the first air outlet through an exhaust passage; the exhaust passage expands in a horn form from the second air outlet to the first air outlet. Air flow conversion of the system can be quickened, system efficiency can be improved; motor cost and system noise can be decreased at the premise of equal performance demands.