The present invention belongs to the technical field of cleaning equipment, and particularly discloses a peanut cleaning machine. The peanut cleaning machine comprises a motor and a cleaning cylinder, and the motor is disposed on the top of the cleaning cylinder; a rotating shaft, which penetrates through the upper and lower ends of the cleaning cylinder, is disposed inside of the cleaning cylinder, a brush is arranged on the rotating shaft, and an output shaft of the motor is connected to the rotating shaft; a feed inlet is disposed at the upper part of the cleaning cylinder, and a drain valve is disposed on the lower part of the cleaning cylinder; a thread-shaped groove is disposed in the inner wall of the cleaning cylinder; a movable rod is fixed on the rotating shaft, a rolling ball is movably connected to the end of the movable rod, and the rolling ball is matched with the groove and can roll along the groove; an isolating net for isolating peanuts from impurities is disposed at the lower part in the cleaning cylinder; a cavity is formed inside the rotating shaft, and the rotating shaft is provided with openings which allow silts to enter; and a transparent observation section is formed at the lower part of the rotating shaft. Cleaning the peanuts by employing the technical solution provided by the invention can thoroughly and completely clean the peanuts, and the cleaning degree of the peanuts can be conveniently observed during cleaning processes.