The present invention discloses an air conditioner, a detection control device and a method for moving parts in the air conditioner. The device comprises a magnetic assembly fixed on the drive part of a drive moving part, x hall detection assemblies, and a control unit. The magnetic assembly comprises z layers of magnetic rings. The detection surface of each layer of the magnetic rings is provided with a plurality of N poles and/or S poles. The x hall detection assemblies are matched with the magnetic poles in magnetism on the detection surfaces of the magnetic rings. The x hall detection assemblies are arranged close to the detection surfaces of the corresponding magnetic rings. When the moving part moves, each hall detection assembly senses the magnetic pole change of the corresponding magnetic rings to generate a corresponding sensing signal. The corresponding magnetic poles of the z layers of magnetic rings are sequentially staggered at a preset angle. The connecting line of the x hall detection assemblies is located within the plane of the axes of the z layers of magnetic rings. The control unit is connected with the x hall detection assemblies. The control unit judges whether the moving part is blocked or not according to x path of sensing signals generated by x hall detection assemblies. Therefore, the blocking phenomenon can be quickly and accurately detected, and the detection sensitivity is high.