The invention relates to an automatic screen-retracting device of an air conditioner. The automatic screen-retracting device of the air conditioner comprises a face shield, a screen-unwinding shaft, a screen-retracting shaft, a drive mechanism and filter screens, wherein the face shield, the screen-unwinding shaft, the screen-retracting shaft, the drive mechanism and the filter screens are installed on an air conditioner host. The filter screens are wound on the screen-unwinding shaft in rolls; and the outer ends of the filter screens are connected to the screen-retracting shaft which is connected with the drive mechanism. The automatic screen-retracting device of the air conditioner is simple in structure, reasonable in design, small in occupied space, low in process requirement, low in manufacturing cost, and reliable and stable in working process. The drive mechanism drives the screen-retracting shaft to rotate for winding the old filter screen back onto the screen-retracting shaft, and at the same time, the new filter screen is drawn out from the screen-unwinding shaft, so that the automatic replacement of the air conditioner filter screens is achieved, the cleanliness of the filter screens of an air inlet part of the air conditioner and the efficient air filtering effect of the air conditioner are guaranteed, the cleanliness of indoor air is guaranteed, and the great significance to providing a sanitary and clean living environment for a user is achieved. Only one time of dismounting, cleaning and replacing of the filter screens is required within a set time period, frequent dismounting, cleaning and replacing of the filter screens of the air conditioner are not required, and great convenience is provided for the user.