The invention provides a device and a method for determining the type of an air sweeping part and an air conditioner. The device comprises a detecting unit and an air sweeping part type determining unit, wherein the detecting unit is used for detecting an air sweeping port and obtaining a port signal, and the air sweeping part type determining unit is used for determining the type of the air sweeping part connected to the air sweeping port according to the port signal and the corresponding relation between the port signal and the type of the air sweeping part. According to the device and the method for determining the type of the air sweeping part and the air conditioner, after an air conditioning unit is installed, different structures or types of air port parts can be connected to the air conditioning unit, and safe and normal operation of the air conditioner can be guaranteed.