The invention discloses a fin maintenance device and an air conditioner. The fin maintenance device comprises a brush head. The brush head is provided with brush teeth. The brush teeth are used for being inserted into gaps of fins. Each brush tooth comprises a repair portion and a cleaning portion, wherein each fin is repaired through the corresponding repair portion and cleaned through the corresponding cleaning portion. When the fin maintenance device operates, the brush teeth on the brush head are inserted into the gaps of the fins; the collapse fins are repaired through the repair portions, and accumulated dust and floccules among the fins are cleared through the cleaning portions; thus, the fins can be cleaned, and the collapse fins can be repaired; and the effect that the single device is used for multiple purposes is achieved.