The invention discloses an all-directional and all-angle cleaning device and method for an insulator. The all-directional and all-angle cleaning device comprises an insulating rod, a motor and an insulating brush cleaner, wherein the upper end of the insulating rod is connected with the motor through an angle adjusting shaft; a rotating shaft of the motor is directly connected with the insulating brush cleaner and is superposed to the rotating axis of the insulating brush cleaner; an included angle theta between the insulating rod and the rotating axis of the insulating brush cleaner can be adjusted through the angle adjusting shaft; an angle locking mechanism is arranged on the angle adjusting shaft and is used for locking the included angle theta. By the angle adjusting shaft and the rotating shaft, the insulating brush cleaner rotates at an optional angle in an optional plane, namely, all-directional and dead-angle-free cleaning is implemented, and the angle adjusting shaft can directly adjust the insulating brush cleaner so that angle adjustment of the insulating brush cleaner can be accurate. In addition, the insulating brush cleaner can be mounted and dismounted quite conveniently and quickly, and therefore, cleaning operation and washing of the brush cleaner are facilitated.