The invention discloses a special cleaning machine based on a PLC system, belonging to a cleaning machine applicable to fruit-vegetable cleaning in the technical field of agricultural machinery. According to the technical scheme, the special cleaning machine comprises a machine body, wherein two connecting rod seats are arranged at the upper end of the machine body and support two ends of a connecting rod, a sleeve sleeves a protruded rod in the middle of the connecting rod and is hinged with a movable rod, the other end of the movable rod is hinged to a lifting rod, a bearing plate is connected to the other end of the lifting rod and comprises a slide block, the slide block is arranged at a slide slot, and the slide slot is formed in the inner wall of the machine body; and a rotating shaft end of a brushing bar is mounted on the inner wall of the machine body, and a PLC control system is mounted on one side of the machine body. The special cleaning machine based on the PLC system hasan overturning cleaning effect, and the automatic operation according to the requirements of a process file can be realized only by virtue of a pre-designed process file, so that the cleaning efficiency and quality are greatly improved.