The invention discloses an insulator sweeping device. The insulator sweeping device comprises a first sweeping and dirt removing mechanism and a second sweeping and dirt removing mechanism which are symmetrically arranged, the first sweeping and dirt removing mechanism and the second sweeping and dirt removing mechanism comprise approximate arc-shaped sweeping and dirt removing machine frames, atleast one pair of arc-shaped connecting arms are arranged on each of the two sides of each sweeping and dirt removing machine frame in an extending mode, a permanent magnet attracting disc is arrangedat a free end of each arc-shaped connecting arm of the first sweeping and dirt removing mechanism, a plurality of travelling devices are arranged on the inner walls of the sweeping and dirt removingmachine frames, the inner walls of the sweeping and dirt removing machine frames are also provided with arc-shaped gear rings and gear ring driving mechanisms for driving the arc-shaped gear rings torotate in a reciprocating mode, and sweeping devices are arranged on the inner walls of the arc-shaped gear rings. According to the insulator sweeping device, sweeping and dirt removing procedures such as up-down travelling and sweeping can be safely and efficiently and automatically completed, high-altitude manual sweeping is replaced, the working safety is improved, the travelling devices and the sweeping devices can be adapted to insulator pieces with different diameters, and the adjusting mode is simple and convenient.