The invention discloses an insulator cleaning device. A rotating cylinder is fixed in a mechanical hand joint, straight toothed spur gears are respectively and fixedly sheathed at two extending ends of the rotating cylinder, a joint rotating shaft is fixed on the mechanical hand joint and is positioned in front of the rotating cylinder, a mechanical hand framework is supported on the joint rotating shaft, a fan-shaped straight toothed gear corresponding to the straight toothed spur gear is arranged on the outer wall of the mechanical hand framework, the fan-shaped straight toothed gear is engaged with the straight toothed spur gear, and a sweeping brush and a spray head are arranged in the mechanical hand framework. Through the arrangement of the cleaning brush, the spray head and the like, the automatic cleaning of an insulator can be realized, the cleaning efficiency is improved, the cleaning is thorough, the work intensity is low, and the insulator cleaning device has the characteristics that the cost is low, the structure is simple, the reliability is good, and the like.