The invention discloses a cleaning and drying device of an air conditioner filter cylinder. The cleaning and drying device of the air conditioner filter cylinder comprises a main folding frame, a first auxiliary support and a second auxiliary support. The tops and the bottoms of the main folding frame, the first auxiliary support and the second auxiliary support are hinged together through stud shafts. A motor is installed at the top end of the main folding frame. The motor is connected with a spline shaft through a rotating shaft. A fixing and pressing disk is installed at the top of the spline shaft. A rubber outer ring is arranged on the outer ring of the fixing and pressing disk. The fixing and pressing disk is fixed to the spline shaft through a fastening button. A base plate is installed at the bottom of the spline shaft. Bottom frames of the main folding frame, the first auxiliary support and the second auxiliary support are provided with fixing mats. The bottom connection portion of the main folding frame, the first auxiliary support and the second auxiliary support are provided with a boss. The main folding frame is provided with a cylinder body in a matched manner. The cleaning and drying device of the air conditioner filter cylinder improves the overall assembly and disassembly performance and portability, and the air conditioner filter cylinder can be conveniently cleaned in daily life; and meanwhile, the cleaning and drying device can be expanded to cleaning of other objects, and therefore the overall practicability is better.